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Electrical Properties of ZnO‐Bi 2 O 3 Ceramics
Author(s) -
MORRIS WILLIAM G.
Publication year - 1973
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1973.tb12686.x
Subject(s) - materials science , amorphous solid , microstructure , ceramic , electrical resistivity and conductivity , thermal conduction , intergranular corrosion , quantum tunnelling , capacitance , phase (matter) , varistor , composite material , electrical conductor , mineralogy , optoelectronics , electrical engineering , crystallography , electrode , chemistry , voltage , organic chemistry , engineering
The nonlinear volt‐ampere characteristics and small‐signal ac capacitance and resistance of sintered ZnO containing 0.5 mol% Bi 2 O 3 were measured. Many of the electrical properties are related directly to the microstructure, which consists of conductive ZnO grains separated by a continuous amorphous Bl 2 O 3 , phase. The origin of the nonlinear conduction in the intergranular phase was confirmed by experiments with evaporated thin films. The proposed conduction mechanism in varistors containing ZnO and Bi 2 O 3 is a combination of hopping and tunneling in the amorphous phase.