113 research outputs found
Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics
We report the polarization, displacement current and leakage current behavior
of a trivalent nonpolar cation Al cation substituted lead free ferroelectric
NBT-BT electroceramics with tetragonal phase and P4mm space group symmetry.
Nearly three orders of magnitude decrease in leakage current were observed
under electrical poling, which significantly improves microstructure,
polarization, and displacement current. Effective poling neutralizes the domain
pinning, traps charges at grain boundaries and fills oxygen vacancies with free
charge carriers in matrix, thus saturated macroscopic polarization in contrast
to that in upoled samples. E-poling changes bananas type polarization loops to
real ferroelectric loops.Comment: 18 pages, 5 figure
Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics
Health in a Developing Country: Principles of Medical Anthropology in Melanesia. By R. L. Pulsford and J. Cawte The Jacaranda Press, Milton, Queensland. 1972. Pp. 188. Price $3.50.
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