Effect of acceptor (Mg) concentration on the electrical resistance at room and high (200°C) temperatures of acceptor (Mg)-doped BaTiO3 ceramics
- 1 September 2007
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 102 (5), 054105
- https://doi.org/10.1063/1.2777119
Abstract
The behaviors of the electrical resistance at room and high temperatures of acceptor (Mg)-doped ceramics with the increase of acceptor concentration were investigated. A series of coarse-grained specimens with different acceptor concentrations that were sintered at various oxygen partial pressures was prepared. The critical acceptor concentrations, beyond which the room temperature resistance increases abruptly, were experimentally evaluated and they were found to increase with a decrease in oxygen partial pressure during sintering. Each defect and electron concentrations at sintering and room temperature as a function of acceptor concentration were theoretically calculated. The results calculated could explain the experimentally observed behavior of the resistance versus acceptor concentration. The high temperature resistances under high electric field showed resistance degradation critically depending on acceptor concentration in the very small concentration range below , which occurred easily with the increase of acceptor concentration. It was explained that such behavior was caused by the variation of potential barrier of grain boundaries for the migration of oxygen vacancies as a function of acceptor concentration.
Keywords
This publication has 19 references indexed in Scilit:
- Modulated and ordered defect structures in electrically degraded Ni–BaTiO3 multilayer ceramic capacitorsJournal of Applied Physics, 2003
- Nonreducible Mechanism of {(Ba1-xCax)O}mTiO2(m>1) CeramicsJapanese Journal of Applied Physics, 2002
- Effect of donor (Nb) concentration on the bulk electrical resistivity of Nb-doped barium titanateJournal of Applied Physics, 2002
- Dielectric materials for sintering in reducing atmospheresJournal of the European Ceramic Society, 2001
- Low-temperature defect chemistry of oxides. I. General aspects and numerical calculationsJournal of Applied Physics, 1999
- Determination of three-dimensional grain size distribution by linear intercept measurementActa Materialia, 1998
- Electrode effects in positive temperature coefficient and negative temperature coefficient devices measured by complex-plane impedance analysisJournal of Applied Physics, 1996
- Bulk Conductivity and Defect Chemistry of Acceptor‐Doped Strontium Titanate in the Quenched StateJournal of the American Ceramic Society, 1991
- dc Electrical Degradation of Perovskite‐Type Titanates: II, Single CrystalsJournal of the American Ceramic Society, 1990
- dc Electrical Degradation of Perovskite‐Type Titanates: I, CeramicsJournal of the American Ceramic Society, 1990