Open AccessCrystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−x Gdx TiTaO9 (x = 0.0, 0.1, 0.2, 0.3) with high Curie temperature
Author(s) -
S. V. Zubkov
Publication year - 2021
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/s2010135x2160016x
Subject(s) - aurivillius , curie temperature , orthorhombic crystal system , materials science , condensed matter physics , perovskite (structure) , crystallography , crystal structure , solid solution , dielectric , thermodynamics , physics , ferroelectricity , ferromagnetism , chemistry , optoelectronics , metallurgy
The Aurivillius phases [Bi 2 O 2 ][A[Formula: see text][Formula: see text]O[Formula: see text]] are well-known ferroelectrics with high Curie temperatures [Formula: see text]. High-temperature piezoceramics Bi[Formula: see text][Formula: see text]TiTaO 9 (BGdTTa, [Formula: see text]= 0.0, 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BGdTTa ceramics have been studied. According to the data of powder X-ray diffraction, all the compounds are single-phase with the structures of two-layer Aurivillius phases ([Formula: see text] = 2) with the orthorhombic crystal lattice (space group A2 1 am). The temperature dependence of the relative permittivity [Formula: see text]/[Formula: see text] ([Formula: see text] of the compounds was measured and showed that the Curie temperature [Formula: see text] of perovskite-like oxides Bi[Formula: see text][Formula: see text]TiTaO 9 increases linearly with an increase in the substitution parameter [Formula: see text] to [Formula: see text] = 925[Formula: see text]C. The activation energies of charge carriers have been found in different temperature ranges.