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Evidence for the Coexistence of Tetragonal and Cubic Phases in n ‐BaTiO 3 under Electric Field
Author(s) -
Ravi V.,
Aslam M.
Publication year - 1999
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.1151-2916.1999.tb01979.x
Subject(s) - tetragonal crystal system , electric field , materials science , condensed matter physics , joule heating , ceramic , phase (matter) , crystallite , capacitance , chemistry , electrode , composite material , metallurgy , physics , organic chemistry , quantum mechanics
Application of an appropriate electric field on donor‐doped polycrystalline BaTiO 3 (tetragonal) leads to the formation of the cubic phase in the specimen because of Joule heating. Coexistence of the tetragonal and cubic phases depends on the magnitude of the applied field and on ambient and ceramic‐body temperature, and it is a prerequisite for the current‐limiting action of these ceramics. The contributions from the tetragonal and cubic phases for the charge transport is evidenced from a capacitance‐voltage measurement.