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Oxygen‐Vacancy‐Related High Temperature Dielectric Relaxation in (Pb 1− x Ba x )ZrO 3 Ceramics
Author(s) -
Zhang TianFu,
Tang XinGui,
Liu QiuXiang,
Jiang YanPing,
Huang XianXiong
Publication year - 2015
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/jace.13317
Subject(s) - dielectric , materials science , atmospheric temperature range , ferroelectricity , activation energy , analytical chemistry (journal) , curie temperature , annealing (glass) , dielectric loss , relaxation (psychology) , dielectric spectroscopy , oxygen , ceramic , phase transition , hysteresis , condensed matter physics , chemistry , thermodynamics , electrode , electrochemistry , metallurgy , psychology , social psychology , physics , optoelectronics , organic chemistry , chromatography , ferromagnetism
( Pb 1− x Ba x ) ZrO 3 ( x = 0, 0.025, 0.05, 0.075, 0.1) ceramics were synthesized by a traditional solid‐state reaction method, and the pure phase was obtained of all sintered samples. For all compositions, substitution of Pb 2+ by Ba 2+ reduced the phase transition temperature of antiferroelectric to ferroelectric and Curie temperature. Polarization–electric field hysteresis loops were conducted and typical ferroelectric hysteresis loops were observed in higher temperature range. Impedance and dielectric measurements were studied on the high temperature relaxation. Relaxation behavior could be suppressed after annealing treatment in oxygen atmosphere. Value of activation energy calculated from impedance was lower than that calculated from conduction measurements. It was concluded that short‐range hopping of oxygen vacancy contributes to the dielectric relaxation and long‐distance movement of doubly ionized oxygen vacancies contributes to the conduction.