The effect of Co, Cr and Nb on the electrical properties of the grain boundaries of SnO2-based varistors was investigated. The powders were prepared by the method of evaporation and decomposition of solutions and suspensions. Varistor samples were obtained by uniaxial pressing followed by sintering at 1300 degrees C for 1h. The electrical properties of the grain-boundary region, such as resistance (R) and capacitance (C), were determined using ac impedance spectroscopy in the 27-330 degrees C temperature interval. Activation energies for conduction (E-A) were calculated from the Arrhenius equation. The non-linear coefficients (alpha) and the breakdown electric fields (E-b) of the samples were determined from the current-voltage characteristics. The potential barrier height (Phi(b)) was calculated using the Schottky-type conducting model. After a comparison of the characteristic parameters for different varistor compositions it was found that the Cr/Nb ratio has a crucial influence on t...he grain-boundary properties in SnO2 varistors.
TY - JOUR
AU - Žunić, Milan
AU - Branković, Zorica
AU - Branković, Goran
AU - Poleti, Dejan
PY - 2006
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/161
AB - The effect of Co, Cr and Nb on the electrical properties of the grain boundaries of SnO2-based varistors was investigated. The powders were prepared by the method of evaporation and decomposition of solutions and suspensions. Varistor samples were obtained by uniaxial pressing followed by sintering at 1300 degrees C for 1h. The electrical properties of the grain-boundary region, such as resistance (R) and capacitance (C), were determined using ac impedance spectroscopy in the 27-330 degrees C temperature interval. Activation energies for conduction (E-A) were calculated from the Arrhenius equation. The non-linear coefficients (alpha) and the breakdown electric fields (E-b) of the samples were determined from the current-voltage characteristics. The potential barrier height (Phi(b)) was calculated using the Schottky-type conducting model. After a comparison of the characteristic parameters for different varistor compositions it was found that the Cr/Nb ratio has a crucial influence on the grain-boundary properties in SnO2 varistors.
PB - Trans Tech Publications Ltd
T2 - Materials Science Forum
T1 - Electrical characterization of the grain-boundary region of SnO2 varistors
EP - 240
SP - 235
VL - 518
UR - https://hdl.handle.net/21.15107/rcub_rimsi_161
ER -
@article{
author = "Žunić, Milan and Branković, Zorica and Branković, Goran and Poleti, Dejan",
year = "2006",
abstract = "The effect of Co, Cr and Nb on the electrical properties of the grain boundaries of SnO2-based varistors was investigated. The powders were prepared by the method of evaporation and decomposition of solutions and suspensions. Varistor samples were obtained by uniaxial pressing followed by sintering at 1300 degrees C for 1h. The electrical properties of the grain-boundary region, such as resistance (R) and capacitance (C), were determined using ac impedance spectroscopy in the 27-330 degrees C temperature interval. Activation energies for conduction (E-A) were calculated from the Arrhenius equation. The non-linear coefficients (alpha) and the breakdown electric fields (E-b) of the samples were determined from the current-voltage characteristics. The potential barrier height (Phi(b)) was calculated using the Schottky-type conducting model. After a comparison of the characteristic parameters for different varistor compositions it was found that the Cr/Nb ratio has a crucial influence on the grain-boundary properties in SnO2 varistors.",
publisher = "Trans Tech Publications Ltd",
journal = "Materials Science Forum",
title = "Electrical characterization of the grain-boundary region of SnO2 varistors",
pages = "240-235",
volume = "518",
url = "https://hdl.handle.net/21.15107/rcub_rimsi_161"
}
Žunić, M., Branković, Z., Branković, G.,& Poleti, D.. (2006). Electrical characterization of the grain-boundary region of SnO2 varistors. in Materials Science Forum
Trans Tech Publications Ltd., 518, 235-240.
https://hdl.handle.net/21.15107/rcub_rimsi_161
Žunić M, Branković Z, Branković G, Poleti D. Electrical characterization of the grain-boundary region of SnO2 varistors. in Materials Science Forum. 2006;518:235-240.
https://hdl.handle.net/21.15107/rcub_rimsi_161 .
Žunić, Milan, Branković, Zorica, Branković, Goran, Poleti, Dejan, "Electrical characterization of the grain-boundary region of SnO2 varistors" in Materials Science Forum, 518 (2006):235-240,
https://hdl.handle.net/21.15107/rcub_rimsi_161 .
