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Elastic and anelastic properties of the 0.55 S r T i O 3 –0.45 B i S c O 3 ceramics characteristic for relaxor ferroelectric behavior
Author(s) -
Ivanov Oleg,
Danshina Elena
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201349244
Subject(s) - electrostriction , tetragonal crystal system , polar , materials science , phase (matter) , elastic modulus , phase transition , ferroelectricity , polarization (electrochemistry) , ceramic , condensed matter physics , analytical chemistry (journal) , dielectric , mineralogy , composite material , chemistry , physics , piezoelectricity , chromatography , optoelectronics , organic chemistry , astronomy
The low‐frequency elastic and anelastic properties of the ceramic 0.55SrTiO 3 –0.45BiScO 3 sample have been studied. Anomalous changes of the Young's modulus and the internal friction characteristic for the ferroelectric relaxors were observed at cooling below the Burns temperature at ∼585 K. The relaxor properties of this system are confirmed by dielectric measurements and attributed to the coexistence of the polar tetragonal P 4 mm phase and the nonpolar cubic Pm 3 m phase. Elastic anomaly is assumed to be due to electrostriction relationship between spontaneous polarization of polar tetragonal domains and strain of the sample. Using the special internal friction mechanism for the first order phase transition, the size of the polar phase nuclei arising at the Burns temperature was estimated to be equal to ∼20 nm.