Structural and electrical properties of ZnO varistors were investigated as a function of spinel composition. Six varistor mixtures differing only in chemical composition of spinel, were prepared by mixing separately synthesized constituent phases (DSCP method). Compositions of constituent phases in sintered samples were investigated by changes of lattice parameters of the phases, as well as by EDS analysis of the constituent phases. It was found that compositions of ZnO, intergranular and spinel phases were partially changed during sintering due to redistribution of additives, that was controlled by starting spinel composition and its stability. Electrical characterization showed significant difference in electrical properties of investigated varistors: nonlinearity coefficients ranging from 22 to 55 and leakage currents differing by the order of magnitude. Activation energies of conduction were obtained from ac impedance spectroscopy measurements. Calculated values of activation energ...ies were in the range 0.61-1.0 eV confirming difference in defect structure of ZnO grain boundaries in varistors containing different spinel phases.
TY - JOUR
AU - Branković, Zorica
AU - Branković, Goran
AU - Poleti, Dejan
AU - Varela, JA
PY - 2001
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/63
AB - Structural and electrical properties of ZnO varistors were investigated as a function of spinel composition. Six varistor mixtures differing only in chemical composition of spinel, were prepared by mixing separately synthesized constituent phases (DSCP method). Compositions of constituent phases in sintered samples were investigated by changes of lattice parameters of the phases, as well as by EDS analysis of the constituent phases. It was found that compositions of ZnO, intergranular and spinel phases were partially changed during sintering due to redistribution of additives, that was controlled by starting spinel composition and its stability. Electrical characterization showed significant difference in electrical properties of investigated varistors: nonlinearity coefficients ranging from 22 to 55 and leakage currents differing by the order of magnitude. Activation energies of conduction were obtained from ac impedance spectroscopy measurements. Calculated values of activation energies were in the range 0.61-1.0 eV confirming difference in defect structure of ZnO grain boundaries in varistors containing different spinel phases.
PB - Elsevier Sci Ltd, Oxford
T2 - Ceramics International
T1 - Structural and electrical properties of ZnO varistors containing different spinel phases
EP - 122
IS - 1
SP - 115
VL - 27
DO - 10.1016/S0272-8842(00)00051-1
ER -
@article{
author = "Branković, Zorica and Branković, Goran and Poleti, Dejan and Varela, JA",
year = "2001",
abstract = "Structural and electrical properties of ZnO varistors were investigated as a function of spinel composition. Six varistor mixtures differing only in chemical composition of spinel, were prepared by mixing separately synthesized constituent phases (DSCP method). Compositions of constituent phases in sintered samples were investigated by changes of lattice parameters of the phases, as well as by EDS analysis of the constituent phases. It was found that compositions of ZnO, intergranular and spinel phases were partially changed during sintering due to redistribution of additives, that was controlled by starting spinel composition and its stability. Electrical characterization showed significant difference in electrical properties of investigated varistors: nonlinearity coefficients ranging from 22 to 55 and leakage currents differing by the order of magnitude. Activation energies of conduction were obtained from ac impedance spectroscopy measurements. Calculated values of activation energies were in the range 0.61-1.0 eV confirming difference in defect structure of ZnO grain boundaries in varistors containing different spinel phases.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Structural and electrical properties of ZnO varistors containing different spinel phases",
pages = "122-115",
number = "1",
volume = "27",
doi = "10.1016/S0272-8842(00)00051-1"
}
Branković, Z., Branković, G., Poleti, D.,& Varela, J.. (2001). Structural and electrical properties of ZnO varistors containing different spinel phases. in Ceramics International
Elsevier Sci Ltd, Oxford., 27(1), 115-122.
https://doi.org/10.1016/S0272-8842(00)00051-1
Branković Z, Branković G, Poleti D, Varela J. Structural and electrical properties of ZnO varistors containing different spinel phases. in Ceramics International. 2001;27(1):115-122.
doi:10.1016/S0272-8842(00)00051-1 .
Branković, Zorica, Branković, Goran, Poleti, Dejan, Varela, JA, "Structural and electrical properties of ZnO varistors containing different spinel phases" in Ceramics International, 27, no. 1 (2001):115-122,
https://doi.org/10.1016/S0272-8842(00)00051-1 . .
