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Dielectric Relaxation of La 3+ ‐Modified Bi 3 TiNbO 9 Aurivillius Phase Ceramics
Author(s) -
Zhou Zhiyong,
Dong Xianlin,
Huang Shiming,
Yan Haixue
Publication year - 2006
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.1551-2916.2006.01166.x
Subject(s) - aurivillius , materials science , dielectric , ceramic , relaxation (psychology) , ferroelectric ceramics , condensed matter physics , polarization (electrochemistry) , phase (matter) , ferroelectricity , analytical chemistry (journal) , mineralogy , nuclear magnetic resonance , chemistry , composite material , physics , optoelectronics , organic chemistry , psychology , social psychology , chromatography
Single Aurivillius phase Bi 3− x La x TiNbO 9 (LBTN‐ x , x =0.00, 0.50, 0.75, and 1.00) ceramics were prepared by the conventional solid‐state reaction method. When x ≤0.50, the ceramics are normal ferroelectrics, while LBTN‐0.75 and LBTN‐1.00 showed typical relaxor behavior, which could probably be attributed to the disordering induced by the La 3+ partly substituting for Bi 3+ in Bi 2 O 2 layers. The dielectric relaxation of LBTN‐0.75 and LBTN‐1.00 were fitted using the Vögel–Fulcher relationship, and the results suggest that both of them are analogous to a spin glass with thermally activated polarization fluctuations above a freezing temperature.