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Role of Domain Processes in Polycrystalline Barium Titanate
Author(s) -
McQUARRIE MALCOLM
Publication year - 1956
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.1151-2916.1956.tb15623.x
Subject(s) - barium titanate , dielectric , poling , ferroelectricity , materials science , polarization (electrochemistry) , ferroelectric ceramics , ceramic , domain wall (magnetism) , crystallite , condensed matter physics , domain (mathematical analysis) , composite material , mineralogy , engineering physics , magnetic field , optoelectronics , metallurgy , physics , chemistry , magnetization , mathematics , mathematical analysis , quantum mechanics
The theory of magnetic domains is reviewed and a comparison is made with the ferroelectric case. The known facts regarding domain processes in barium titanate are summarized and an attempt is made to apply these facts to the formulation of mechanisms for several electrical processes in ceramic barium titanate. It is suggested that the initial (low alternating field) dielectric constant of the material is due mainly to induced polarization, with some contribution (about 20%) from 90° domain wall motion, a mechanism which makes a much larger contribution to the dielectric losses at 1000 cycles. The poling process (to make the material piezoelectrically active) is visualized as a removal of 180° domain walls, with only a temporary motion of 90° domain walls. The aging process is thought to be due to the removal from the dielectric polarization of the contribution of the 90° wall motion.