Open AccessAbnormal phase transition and polarization mismatch phenomena in BaTiO3-based relaxor ferroelectrics
Author(s) -
Qingyuan Hu,
Xiaoyong Wei
Publication year - 2019
Publication title -
journal of advanced dielectrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.38
H-Index - 13
eISSN - 2010-135X
pISSN - 2010-1368
DOI - 10.1142/s2010135x19300020
Subject(s) - materials science , condensed matter physics , dielectric , phase transition , curie temperature , polarization (electrochemistry) , ferroelectricity , piezoelectricity , solid solution , physics , ferromagnetism , chemistry , optoelectronics , metallurgy , composite material
Relaxor ferroelectrics have been extensively studied due to their outstanding dielectric, piezoelectric, energy storage, and electro-optical properties. Although various theories were proposed to elaborate on the relaxation phenomena, polar nanoregions formed by disruption of the long-range-order structures are considered to play a key role in relaxor ferroelectrics. Generally, relaxor ferroelectrics are formed by aliovalent substitution or isovalent substitution in normal ferroelectrics, or further combinations of solid solutions. Herein, one category of BaTiO 3 -based relaxor ferroelectrics with abnormal phase transition and polarization mismatch phenomena is focused. Characteristic parameters of such BaTiO 3 -based relaxor ferroelectrics, including the Curie temperature, polarization, and lattice parameter, show a typical “U”-shaped variation with compositions. The studied BaTiO 3 -based relaxor ferroelectrics are mostly solid solutions of [Formula: see text]-site coupling and [Formula: see text]-site coupling ferroelectrics, exhibiting polarization mismatch in certain compositions [e.g., 0.9BaTiO 3 –0.1BiScO 3 , 0.8BaTiO 3 –0.2Bi([Formula: see text][Formula: see text]O 3 , 0.8BaTiO 3 –0.2Bi([Formula: see text][Formula: see text]O 3 , 0.5BaTiO 3 –0.5Pb([Formula: see text][Formula: see text]O 3 , 0.4BaTiO 3 –0.6Pb([Formula: see text][Formula: see text]O 3 , etc.]. Of particular interest is that excellent electrical properties can be achieved in the studied relaxor ferroelectrics. Therefore, polarization mismatch theory can also provide guidance for the design of new high-performance lead-free relaxor ferroelectrics.