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Relaxor Characteristics of Morphotropic Phase Boundary (Bi 1/2 Na 1/2 )TiO 3 –(Bi 1/2 K 1/2 )TiO 3 Modified with Bi(Zn 1/2 Ti 1/2 )O 3
Author(s) -
Dittmer Robert,
Jo Wook,
Daniels John,
Schaab Silke,
Rödel Jürgen
Publication year - 2011
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.1551-2916.2011.04631.x
Subject(s) - phase boundary , permittivity , electric field , materials science , piezoelectric coefficient , dielectric , analytical chemistry (journal) , ferroelectricity , relative permittivity , phase transition , piezoelectricity , condensed matter physics , polarization (electrochemistry) , microstructure , mineralogy , phase (matter) , chemistry , composite material , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
Morphotropic phase boundary (Bi 1/2 Na 1/2 )TiO 3 –(Bi 1/2 K 1/2 )TiO 3 ( BNT–BKT ), was modified with increasing additions of Bi(Zn 1/2 Ti 1/2 )O 3 ( BZT ). Microstructure, electric‐field‐induced strain and polarization, dielectric permittivity, and temperature‐dependent piezoelectric coefficient were investigated and compared with crystal structure measured in situ as a function of applied electric field. Furthermore, permittivity and piezoelectric coefficient were characterized as a function of electric field. For small additions of BZT , an applied electric field leads to an irreversible phase transition into a ferroelectric phase with remanent polarization and a reduced relative permittivity. Increasing the content of BZT increased the threshold field for the transition. For additions of more than 2 mol% BZT , the piezoelectric coefficient dropped, permittivity remained almost constant, and a high normalized strain of up to 500 pm/V was observed. However, no field‐dependent structural change was evidenced by the in situ X‐ray experiment.