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Long‐Time Relaxation from Relaxor to Normal Ferroelectric States in Pb 0.91 La 0.06 (Zr 0.65 Ti 0.35 O 3
Author(s) -
Dai Xunhu,
Xu Z.,
Viehland Dwight
Publication year - 1996
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.1151-2916.1996.tb08019.x
Subject(s) - materials science , dielectric , condensed matter physics , relaxor ferroelectric , ferroelectricity , relaxation (psychology) , diffraction , polar , transmission electron microscopy , optics , nanotechnology , physics , optoelectronics , social psychology , astronomy , psychology
Pb 0.91 La 0.06 (Zr 0.65 Ti 0.35 )O 3 (PLZT 6/65/35) is a relaxor ferroelectric near and above the temperature of the dielectric maximum (∼180°C). The relaxor state can persist to room temperature upon fast cooling. However, this relaxor state gradually changes to a normal ferroelectric over a long time period at 25°C, characterized by an elimination of relaxor‐like dielectric dispersion and a significant rhombo‐hedral broadening and subsequent splitting of the (220) X‐ray diffraction peak. A transmission electron microscopy (TEM) bright‐field image of a long‐time relaxed sample revealed normal micrometersized ferroelectric domain contrast with relaxor‐like “tweed” structure on the submi‐crometer scale. The gradually structural evolution is discussed in terms of development of correlations between relaxor polar clusters.