Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 24, Issue 8, Pages 2465-2470Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2003.08.009
Keywords
domains; lead iron mobate; Pb(FeNb)O-3; PTCR; TEM; XPS
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The positive temperature coefficient of resistivity (PTCR) effect in ferroelectric Pb(Fe1/2Nb1/2)O-3 (PFN) ceramics was examined to deter-mine its physical meaning as the evidence of the ferroelectric domain structure. Monitoring of the temperature dependence of resistivity showed that its PTCR effect begins around the dielectric maximum temperature (T-m). The existence of the space charge region near the grain boundary was verified via impedance spectroscopy, and X-ray photoelectron spectroscopy (XPS) indicated it to be due to Pb volatilization during the sintering process. In addition, well-development ferroelectric domain structure, which was expected to be found according to Jonker's theory, was observed with transmission electron microscopy (TEM). (C) 2003 Elsevier Ltd. All rights reserved.
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