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Electrical Properties of Single‐Crystal and Polycrystalline Alumina at High Temperatures
Author(s) -
PAPPIS J.,
KINGERY W. D.
Publication year - 1961
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.1151-2916.1961.tb13756.x
Subject(s) - electrical resistivity and conductivity , partial pressure , oxygen , conductivity , crystallite , materials science , single crystal , atmospheric temperature range , thermal conduction , oxide , analytical chemistry (journal) , oxygen pressure , crystal (programming language) , aluminum oxide , aluminium , mineralogy , chemistry , composite material , thermodynamics , crystallography , metallurgy , electrical engineering , programming language , physics , organic chemistry , chromatography , computer science , engineering
The electrical conductivity of single‐crystal and polycrystalline aluminum oxide has been measured over the temperature range 1300° to 1750°C. and at oxygen partial pressures of 10° to 10 −10 atmospheres. Alumina exhibits p‐ type conductivity at high oxygen pressures and n ‐type conductivity at low oxygen pressures. The variation of conductivity with temperature depends on the specimen purity, oxygen pressure, and temperature level. Activation energies varying between 2.6 and 5.8 e.v. were found. The conductivity of alumina does not result from any single simple process over wide ranges of temperature and oxygen partial pressure. Apparently intrinsic conduction is found for single crystals at temperatures above 1600°C.