اساتید - دانشکده فنی و مهندسی دانشگاه مراغه

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سوابق تحصیلی

دکتری:
مهندسی و علم مواد- 1388-1393-پژوهشگاه مواد وانرژی

کارشناسی ارشد:
سرامیک- 1385-1388-دانشگاه صنعتی شریف

کارشناسی:
مهندسی متالورژی صنعتی- 1381-1385- دانشگاه آزاد اسلامی نجف آباد

سوابق تدریس

کارشناسی:
دیرگداز، خواص فیزیکی مواد، کریستالوگرافی، شیمی فیزیک و ترمودینامیک، ریخته گری، الکترو سرامیک، پرسلانها،

کارشناسی ارشد:
ترمودینامیک پیشرفته و سینتیک نانومواد، نانوالکترونیک

زمینه های پژوهشی

الکتروسرامیک ها
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رتبه ممتاز در مقطع کارشناسی
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عضو بنیاد ملی نخبگان
انتخاب پایان نامه دکتری بعنوان پایان نامه برتر مورد نیاز صنعت در سال 94
برگزیده نانومچ 3

عضویت در مجامع علمی و انجمن ها

مقالات ارائه شده

مقالات چاپ شده در مجلات

عنوان مقاله : An engineering design based on nano/micro-sized composite for CaTiO3/ CaCu3Ti4O12 materials and its dielectric and non-Ohmic properties

نویسنده رابط : Mohammad Maleki Shahraki

عنوان مجله و شماره مجله : Ceramics International

نویسندگان : Hossein Daeijavad ,Mohammad Maleki Shahraki, Amir Hossein Emami, Mehdi Abdollahi, Asadollah Karimi

سال انتشار : 2019

چکیده :

عنوان مقاله : An engineering design based on nano/micro-sized composite for CaTiO3/ CaCu3Ti4O12 materials and its dielectric and non-Ohmic properties

نویسنده رابط : محمد مالکی

عنوان مجله و شماره مجله : Ceramics International

نویسندگان : محمد مالکی، حسین داییجواد، امیرحسین امامی، مهدی عبداللهی، اسداله کریمی

سال انتشار : In p

چکیده :

عنوان مقاله : Low temperature sintering of magnetic Ni0. 5Co0. 5Fe2O4 ceramics prepared from mechanochemically synthesized nanopowders

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 45

نویسندگان : Mehdi Delshad Chermahini, Hasan Ahmadian Baghbaderani, Mohammad Maleki Shahraki, Mahdi Kazazi

سال انتشار : 2019

چکیده : The effect of mechanochemichally synthesized nanoceramics Ni0.5Co0.5Fe2O4 (NCF) on the sintering process was studied. After 60 h of mechanochemichal treatment, the amount of formed ferrite phase reaches to about 70 vol%. From 60–100 h 10% increase in volume fraction of synthesized magnetic phase can be observed. Further increment in process time had no remarkable effect on the NCF phase formation. After 60 h, ceramic nanoparticle formation is directly reflected by TEM image and specific surface area (28 m2/g equivalent to 40 nm in diameter). The coercivity (Hc) shows a drastic diminution from 1996 to about 159 Oe by 60 h process time. Further milling treatment has no observable effect on the values of Hc. Additionally, the magnetization saturation (Ms) increases up to ~13 emu/g by 60 h mechanical milling of powders mixture. Thereafter from 60 h to 100 h, the Ms rapidly increased from 13 to 32 Oe. Finally, with continuing mechanochemichal process up to 130 h the Ms slightly diminished (~29 emu/g). Additionally, compared to synthesized powders the higher values of MS (65 emu/g) and lower values of HC (140 Oe) for sintered ceramic were detected. The low sintering temperature (1300 °C) for magnetic NCF sample prepared from nanoparticles may be caused by the high activity of nanoceramics.

عنوان مقاله : Ultra-high voltage SnO2 based varistors prepared at low temperature by two-step sintering

نویسنده رابط :

عنوان مجله و شماره مجله : Journal of Alloys and Compounds, 805

نویسندگان : Mohammad Maleki Shahraki, Mehdi Delshad, Siamak Ailpour, Pezhman Mahmoudi, Iman Safaee, Mehdi Abdollahi

سال انتشار : 2019

چکیده : In this research, full density, single phase microstructure (in the XRD and SEM detection limits), and fine-grained SnO2 varistors with an average grain size of 0.65 μm was acquired at low temperature by the two-step sintering technique. The sintering temperature was successfully decreased from 1300 °C in the normal sintering to 1150 °C and 1100 °C of respectively the first and the second stage in the two-step sintering. The mechanism of grain growth suppression of the two-step sintered samples was discussed and it was suggested that in addition to triple point junction, solute drag and/or nano-secondary phases contribute to cease the grain growth. These SnO2 varistors exhibited ultra-high breakdown electric field of 26 kV/cm with a nonlinear coefficient of about 120 in the 1–10 mA/cm2 standard. The exact evaluation showed that this high value of the nonlinear coefficient is artificial and was the result of joule-self heating phenomenon. The true value of the nonlinear coefficient (28) is measured within the 0.1–1 mA/cm2 standard. Due to the joule self-heating phenomenon, the thermal runaway was observed for ultra-high voltage SnO2 varistors in DC-accelerated aging test conditions (0.85 E1mA/cm2 and room temperature). By changing DC-accelerated aging electric field to 0.85 E0.1 mA/cm2, TSS3-20h presented excellent stability after 10 h from room temperature to 75 ᵒC.

عنوان مقاله : Novel Ce0.8Pr0.2O2 nanotube arrays synthesized by hydrothermal method with excellent catalytic performance

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 45

نویسندگان : I Safaee, M Kazemzad, M Maleki Shahraki, S Alipour, M Delshad

سال انتشار : 2019

چکیده : In this research, nanotube arrays of Ce0.8Pr0.2O2 were synthesized on a monolith cordierite honeycomb by the low temperature hydrothermal method. Pre-synthesized ZnO nano-rods on cordierite act as a hard template for Ce0.8Pr0.2O2 deposition. The formation of Ce0.8Pr0.2O2 nanotube arrays was characterized by XRD, selective chemical leaching, BET, and FESEM. The calculated surface area of Ce0.8Pr0.2O2 nanotube arrays was 80 m2/g. The external diameter and the wall thickness of Ce0.8Pr0.2O2 nanotube arrays were 250 and 100 nm, respectively. In addition, Ce0.8Pr0.2O2 nanotube had a length of about 1 μm. Pd decorated nanotube arrays catalyst present a lower light-off temperature and a higher thermal stability than a commercial catalyst in CO conversion catalyst test. Thermal stability of this catalyst is 10 times more than the commercial catalyst at 200 °C. The excellent catalyst performance of Ce0.8Pr0.2O2 nanotube arrays can be attributed to the presence of praseodymium, a high surface area, and a thick wall of Ce0.8Pr0.2O2 nanotubes arrays.

عنوان مقاله : The control of abnormal grain growth in low-voltage SnO2 varistors by microseed addition

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 454

نویسندگان : Mohammad Maleki Shahraki, Mohammad Golmohammad, Iman Safaee, Mehdi Delshad Chermahini

سال انتشار : 2018

چکیده : In this research, the addition effects of three different quantities of micron-sized seeds (microseeds) to a SnO2 varistor prepared from nanomaterials on the microstructure and electrical properties were studied. Moreover, surge-withstanding capability of low-voltage SnO2 varistors was investigated. The X-ray diffraction pattern disclosed a single phase SnO2 for microseed grains. The morphological features of samples were characterized using scanning electron microscopy. The abnormal distribution of grain size with elongated grains of SnO2 in fine grains matrix was observed in sintered samples without microseeds. The low content of microseed addition (0.3 wt%) had not controlled abnormal grain growth, however, it increased mean grain size to 37 µm. Although the high content of microseeds (7.5 wt%) stopped abnormal grain growth, it had a negative effect on relative density and mean grain size. The normal …

عنوان مقاله : Synthesis and characterization of nanoflaky maghemite (γ-Fe2O3) as a versatile anode for Li-ion batteries

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 45

نویسندگان : Mohammad Golmohammad, Mohammad Maleki Shahraki, F Golstanifar, A Mirhabibi, G Yang

سال انتشار : 2019

چکیده : In this study, nanoflaky maghemite (γ-Fe2O3) was successfully prepared by heating of synthesized lepidocrocite (γ-FeO(OH)). Once maghemite obtained, the electrochemical performance of nanoflaky maghemite, as an anode for Li-ion batteries, was investigated. Synthesis of lepidocrocite was optimized by adjusting the heating time and ratio of ethylene glycol (EG) to water in solution. The results revealed that with equal ratio of EG to water, the obtained phase was crystalline lepidocrocite whereas in other ratios lepidocrocite was not the only emerged phase. Field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) results revealed that increasing heating time has no effect on morphology. This increment only led to the slight crystallite growth and agglomeration of precipitation. The optimized lepidocrocite were heated at 230 °C for 2 h to form maghemite, which was confirmed by using XRD. FESEM, high-resolution transmission electron microscopy, and nitrogen adsorption-desorption results disclosed that the particles have flaky morphology with thickness of less than 10 nm and surface area of 105 m2 g−1. Cyclic voltammetry results of anode body (prepared using nanoflaky maghemite) demonstrated reversible formation pathway of iron and lithium oxide through discharging and charging. Moreover, galvanostatic charge–discharge cycling showed a reversible capacity of about 480 mAh g−1 after 50 cycles at current density of 500 mA g−1. Good cyclability, and capacity retention of the anode is due to the nananometric size and flaky shape of the maghemite particles. These particles’ shape made it easier for them to expand and contract in thickness direction with minimized

عنوان مقاله : Multiferroic properties of novel lead-free KNN-LT/20NZCFO magneto-electric composites

نویسنده رابط :

عنوان مجله و شماره مجله : ,233,Materials Letters

نویسندگان : Mehdi Delshad Chermahini, Mohammad Maeki Shahraki, Mehdi Kazazi

سال انتشار : 2018

چکیده : Novel multiferroic composites of 0.95Na0.52K0.48Nb03-0.05LaTiO3 (KNN-LT) as ferroelectric matrix and 20 vol% Ni0.2Zn0.3Co0.5Fe2O4 (NZCFO) as ferromagnetic reinforcement successfully prepared by a conventional sintering process. In X-ray spectra, both the characteristics peaks of ferroelectric KNN-LT and ferromagnetic NZCFO phases without any impurity phase were clearly observed. Both in pure ferroelectric and composite samples the orthorhombic symmetry of KNN based piezoceramic was detected. In FESEM images, the characteristic cube-like morphology of KNN-LT phase and regular polygonal grains of NZCFO ferrite indicates the successful sintering process of multiferroic composites. The simultaneous ferroelectric (based on P-E loop) and ferromagnetic (according to M-H curve) behaviors of KNN-LT/NZCFO approves that this composite can be known as a novel lead free multiferroic composite. The excellent values of Ps ∼ 9 µC/cm2 and Ms ∼ 14 emu/g for this magnetoelectric composite were obtained.

عنوان مقاله : Grain growth kinetics and electrical properties of CuO doped SnO2-based varistors

نویسنده رابط : Mohammad Maleki Shahraki

عنوان مجله و شماره مجله : Journal of Alloys and Compounds 770

نویسندگان : Pezhman Mahmoudi, Ali Nemati, Mohammad Maleki Shahraki

سال انتشار : 2018

چکیده : Up to now, attempts for developing coarse-grained SnO2-based varistors which exhibit high nonlinearity property at lower voltage have become a challenge without any prominent result because of its unknown grain growth mechanism. In this study, the effect of CuO addition to SnO2-based varistors as a grain growth enhancer additive on microstructural development, grain growth kinetics, and electrical properties was investigated. The characterization of grain growth kinetics showed that CuO addition encouraged grain growth and enhanced the grains size as it could be seen in the activation energy which decreased from 594 kJ/mol to 364 kJ/mol. In the samples with a low amount of CuO, the solute drag force is the controlling mechanism of grain growth. By further addition, the mechanism changed to the Sn4+ solution-precipitation in CuO-rich liquid phase. Also, the electrical properties of CuO doped samples showed that they are so promising for low voltage applications.

عنوان مقاله : Novel multifunctional capacitor-varistor ceramics based on SnO2

نویسنده رابط : Mohammad Maleki Shahraki

عنوان مجله و شماره مجله : Ceramics International, 44

نویسندگان : Mohammad Maleki Shahraki, Siamak Ailpour, Pezhman Mahmoudi, Asadollah Karimi

سال انتشار : 2018

چکیده : Up to now, multifunctional varistor-capacitor materials were based on TiO2, even though these materials failed to have practical applications. For the first time, in this research, multifunctional varistor-capacitor properties are observed in the CuO-doped SnO2-CoO-Sb2O3 system. The XRD analysis showed that this system has a single phase microstructure. SEM images indicated that the CuO addition resulted in a better densification and larger grain size. The very low electric breakdown field of the CuO-doped SnO2-CoO-Sb2O3 system (12 V/mm, similar to TiO2), is a consequence of coarse-grained microstructure. This varistor had a suitable surge withstand capability as well. The colossal dielectric constant of about 4.5 * 104 was observed in CuO doped-SnO2 system. This immense constant dielectric can be explained by the internal barrier layer capacitor model. These results attest that the novel multifunctional varistor-capacitor materials based on SnO2 can be used in practical applications.

عنوان مقاله : Fine-grained SnO2 varistors prepared by microwave sintering for ultra-high voltage applications

نویسنده رابط : mohammad maleki shahraki

عنوان مجله و شماره مجله : Materials letter , 230

نویسندگان : Mohammad Maleki Shahraki, Pezhman Mahmoudi, Mehdi Abdollahi, Touradj Ebadzadeh

سال انتشار : 2018

چکیده : In this research, fine-grained SnO2-based varistors with a simple microstructure and the mean grain size of 0.8 µm were obtained by the microwave sintering method. The breakdown electric field measured for these varistors was 12 kV/cm that is 3 times higher than the conventional-sintered varistors. The high nonlinear coefficient (60) and low leakage current density (9 µA/cm2) were achieved in fine-grained SnO2 varistors. The fine-grained SnO2 varistors appropriately clamped pulse current surges and the calculated value of the clamping voltage ratio of these varistors was 2. The excellent electrical properties and protective effect of fine-grained SnO2 varistors showed that these varistors are astonishingly suitable for ultra-high voltage applications.

عنوان مقاله : Enhanced multiferroic properties of sono-synthesized BiFeO⁠3 nanoceramics by co-doping of Sm and Mn elements

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 44

نویسندگان : Mehdi delshad chermahini, Iman Safaee, Mehdi Kazai, Mohammad Maleki Shahraki

سال انتشار : 2018

چکیده : Both BiFeO3 (BFO) and Bi0.95Sm0.05Fe0.94Mn0.06O3 (BSFMO) nanoparticles were synthesized by the sonochemical technique. Microstructure and multiferroic properties of both BFO and BSFMO samples as a function of synthesis temperature were investigated. For BSFMO ceramic, pure perovskite phase was observed without any trace of conventional impurity ones; while a secondary phase (Bi2Fe4O9) are clearly observed in the XRD pattern of BFO ceramics. The TEM plots directly verify the formation of nano-sized ceramic powders for the both BFO and BSFMO systems. For each calcination temperature, the MS amounts of BSFMO nanoparticles are significantly higher than pristine ceramic. With decreasing temperature from 600 to 550 °C, the HC increases from 421 to 505 Oe and 297–418 Oe for BFO and BSFMO, respectively. From 550 to 400 °C, the HC diminishes for both pristine (~ 56%) and doped ceramics (~ 39%) due to the effect of nanocrystallites size smaller than magnetic exchange length. In addition, Sm and Mn co-doped sample shows an improved ferroelectric loop with lower leakage current. Generally, it was found that multiferroic (ferromagnetic and ferroelectric) properties of BSFMO ceramics were higher than BFO samples.

عنوان مقاله : Effect of microwave sintering on the microstructure and electrical properties of low voltage ZnO varistors

نویسنده رابط :

عنوان مجله و شماره مجله : Materials & Manufacturing Processes, 33

نویسندگان : Kazem Tahmasebi, Mohammad Maleki Shahraki, Touraj Ebadzadeh

سال انتشار : 2018

چکیده : Coarse-grained ZnO varistors for low-voltage applications were prepared by microwave sintering technique under different soaking times of 5–150 min. For comparison, a low-voltage ZnO varistor was also prepared through a conventional sintering process. Microwave sintering remarkably enhanced the grain growth rate of ZnO varistors. Average grain size of the sample prepared by microwave sintering in 15 min was about 20 µm, which is similar to the grain size of sample prepared conventionally in 150 min time. In addition to grain growth, an increase in microwave sintering time led to precipitation of zinc titanate (Zn2TiO4) on the top surface of samples which sintered for long dwell times. X-ray diffraction and scanning electron microscopy results from different points of the samples declared that precipitation of Zn2TiO4 phase is due to the high rate of bismuth evaporation of Bi-rich liquid from top surface and the reaction between remaining titanium ions on the surface with ZnO. The results showed that increasing sintering time from 5 to 150 min increased the grain size from 14 to 33 µm, consequently, the breakdown field decreased from 90 to 27 V/mm, respectively. These changes led to a switch in the varistor application, from low to very low voltage.

عنوان مقاله : Novel SnO 2 ceramic surge absorbers for low voltage applications

نویسنده رابط :

عنوان مجله و شماره مجله : Materials letter , 145

نویسندگان : M Maleki Shahraki, MA Bahrevar, SMS Mirghafourian, AB Glot

سال انتشار : 2015

چکیده : To make SnO2–CoO–Nb2O5–Cr2O3–Y2O3–Bi2O3 ceramics suitable for low voltage varistor applications, the amount of Bi2O3 addition to a well-known SnO2-based composition for high voltage varistors was optimized. The addition of 0.15 mol% Bi2O3 has resulted in a single phase ceramic material with the average grain size of 30 μm and electrical properties useful for low voltage varistors. The obtained SnO2 low voltage varistors exhibit excellent electrical properties as surge absorbers.

عنوان مقاله : Two-step sintering of ZnO varistors

نویسنده رابط :

عنوان مجله و شماره مجله : Solid State Ionics 190

نویسندگان : Mohammad Maleki Shahraki, Seyyed Ali Shojaee, Mohammad Ali Faghihi Sani, Ali Nemati, Iman Safaee

سال انتشار : 2011

چکیده : In this research, effects of two-step sintering parameters, such as first and second step sintering temperatures (T1 and T2, respectively) and soaking time in the second step, on microstructure and electrical properties of ZnO varistors have been studied. In addition, slow rate of grain growth in the second step of sintering has also been investigated. Near fully dense (higher than 99%) and sub-micron grain size (1–0.75 μm) ZnO varistors have been fabricated by different two-step sintering cycles. Decreasing T1 and T2 result in longer necessary time in the second step to reach near full density with smaller final grain size. The superior electrical properties of varistors (VB: 2050–1022 V/mm and α: 96–60) are attributed to very fine microstructure and high concentration of ZnO–ZnO grains direct contacts. Furthermore, lower T1 and T2 with shorter soaking time improve electrical properties of the ZnO varistors.

عنوان مقاله : Microstructural characteristics and grain growth kinetics of Pr 6 O 11 Doped SnO 2-based varistors

نویسنده رابط :

عنوان مجله و شماره مجله : Solid State Ionics 189

نویسندگان : Iman Safaee, Mohammad Ali Bahrevar, Mohammad Maleki Shahraki, Saeid Baghshahi, Kamran Ahmadi

سال انتشار : 2011

چکیده : The effect of the addition of various amounts of Pr6O11 on the grain growth and densification process, microstructure, formation and distribution of secondary phases, and electrical properties of SnO2-based varistors containing cobalt and niobium oxides has been investigated. It has been observed that in the presence of as low as 0.1 mol% of Pr6O11, the formation of Pr2Sn2O7 can be detected using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The kinetics of grain growth in samples without and with praseodymium oxide has shown that increasing Pr6O11 from 0 to 0.5 mol%, changes the grain growth exponent from 2 to 6 and the activation energy from 350 kJ/mol to around 700 kJ/mol. This may be due to the cooperative effect of the secondary phases. The largest nonlinear coefficient, α, and the lowest leakage current, IL, has been observed for the sample containing 0.05 mol% Pr6O11 whereas the highest breakdown voltage has been recorded for the sample with 0.5 mol% Pr6O11.

عنوان مقاله : High voltage SnO2 varistors prepared from nanocrystalline powders

نویسنده رابط :

عنوان مجله و شماره مجله : Journal of Materials Science: Materials in Electronics, 21

نویسندگان : Mohammad Maleki Shahraki, Seyyed Ali Shojaee, Ali Nemati, Mohammad Ali Faghihi Sani

سال انتشار : 2010

چکیده : In this study, SnO2-based varistors were prepared from mechanically activated nanocrystalline powders. Nanocrystalline powders were derived by subjecting the initial powders to intensive high-energy activation with different times and ball to powder ratio. The effect of activation parameters on the powder properties and sintering temperature, as well as microstructural, micro-electrical and macro-electrical properties of the final specimens was evaluated. Varistors derived from high-energy mechanical activation exhibit a higher density (98.3% relative density) and more refined microstructure upon sintering at 1,300 °C in comparison varistors prepared from conventional powders. Breakdown voltage and nonlinear coefficient were increased up to 24 kV/cm and 45 respectively.

عنوان مقاله : Microstructural and electrical properties of varistors prepared from coated ZnO nanopowders

نویسنده رابط :

عنوان مجله و شماره مجله : Journal of Materials Science: Materials in Electronics, 21

نویسندگان : Seyyed Ali Shojaee, Mohammad Maleki Shahraki, Mohammad Ali Faghihi Sani, Ali Nemati, Abbas Yousefi

سال انتشار : 2010

چکیده : This paper describes a solution-based technique for fabrication of varistor grade composite nanopowders. The method consists of coating major varistor dopants on the surface of the ZnO nanoparticles. As a result, a homogenous mixture of dopants and ZnO nanoparticles will be achieved. TEM results indicated that a composite layer of dopants with the average particle size of 9 nm on the surface of ZnO nanoparticles has been successfully prepared. Sintering of the coated powders was performed in temperatures as low as 850 °C and final specimens with average particle size of 900 nm and density of 98.5% were achieved. In comparison to conventional mixing, varistors prepared from coated nanopowders exhibited superior electrical properties and microstructure homogeneity. The improvement of electrical properties can be attributed to small grain size, homogenous distribution of dopants and elimination of large Bi-Pockets. In addition, the processing route of schottky barrier formation is quite different from what is generally considered as the method of barrier formation in ZnO grain boundaries.

عنوان مقاله : The effect of TiO 2 addition on microstructure and electrical properties of SnO 2 varistors prepared from nanomaterials

نویسنده رابط :

عنوان مجله و شماره مجله : Ceramics International, 41

نویسندگان : Mohammad Maleki Shahraki, Mohammad Ali Bahrevar, Seyed Mohammad Sadegh Mirghafourian

سال انتشار : 2015

چکیده : The effects of various amounts of TiO2 in the composition of SnO2-based varistors made from nano-sized materials on microstructure and electrical properties have been investigated. Titanium oxide acts as both a densifier and grain growth enhancer resulting in relative densities in the range of 96–99%. The addition of TiO2 from 0 to 3 mol% has changed the average grain size from 1.8 to 5 μm. The introduction of TiO2 causes precipitation of Ta2O2.2 phase on the sample surfaces. The lowest breakdown field, 2 kV/cm, has been observed for the sample containing 0.75 mol% of TiO2, and the best surge-withstand parameters (residual voltage ratio, 2.4, withstanding surge current density, 5 kA/cm2) have been observed for the sample with 0.25 mol% TiO2. Larger amounts of TiO2 have had an adverse effect on the surge-withstand capability due to the loss of homogeneity in the samples caused by tantalum transpiration.

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Ceramics International
Materials Characterization
Solid State Ionics

دانشکده فنی و مهندسی دانشگاه مراغه - محمد مالكي شهركي

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مقالات ارائه شده

مقالات چاپ شده در مجلات

عنوان مقاله : An engineering design based on nano/micro-sized composite for CaTiO3/ CaCu3Ti4O12 materials and its dielectric and non-Ohmic properties

عنوان مقاله : An engineering design based on nano/micro-sized composite for CaTiO3/ CaCu3Ti4O12 materials and its dielectric and non-Ohmic properties

عنوان مقاله : Low temperature sintering of magnetic Ni0. 5Co0. 5Fe2O4 ceramics prepared from mechanochemically synthesized nanopowders

عنوان مقاله : Ultra-high voltage SnO2 based varistors prepared at low temperature by two-step sintering

عنوان مقاله : Novel Ce0.8Pr0.2O2 nanotube arrays synthesized by hydrothermal method with excellent catalytic performance

عنوان مقاله : The control of abnormal grain growth in low-voltage SnO2 varistors by microseed addition

عنوان مقاله : Synthesis and characterization of nanoflaky maghemite (γ-Fe2O3) as a versatile anode for Li-ion batteries

عنوان مقاله : Multiferroic properties of novel lead-free KNN-LT/20NZCFO magneto-electric composites

عنوان مقاله : Grain growth kinetics and electrical properties of CuO doped SnO2-based varistors

عنوان مقاله : Novel multifunctional capacitor-varistor ceramics based on SnO2

عنوان مقاله : Fine-grained SnO2 varistors prepared by microwave sintering for ultra-high voltage applications

عنوان مقاله : Enhanced multiferroic properties of sono-synthesized BiFeO⁠3 nanoceramics by co-doping of Sm and Mn elements

عنوان مقاله : Effect of microwave sintering on the microstructure and electrical properties of low voltage ZnO varistors

عنوان مقاله : Novel SnO 2 ceramic surge absorbers for low voltage applications

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