Open AccessInfluence of composition nonstoichiometry and ordering effects on the properties of ferroelectric ceramics based on lead magnoniobate
Author(s) -
Alla Lebedinskaya,
A. G. Rudskaya
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1008/1/012061
Subject(s) - dielectric , ferroelectricity , superstructure , materials science , ceramic , lattice constant , dissipation factor , stoichiometry , diffraction , lattice (music) , composition (language) , ferroelectric ceramics , analytical chemistry (journal) , condensed matter physics , chemistry , thermodynamics , optics , composite material , physics , optoelectronics , linguistics , philosophy , chromatography , acoustics
The effects of violation of the stoichiometry of lead magnoniobate in the preparation of compositions (1-x)PbMg 1/3 Nb 2/3 O 3 – xPbMg 1/2 Nb 1/2 O 2,75 with a step of 0.1 and 0≤x≤1 have been studied by X-ray diffraction methods. Differences in the unit cell parameters of the ferroelectric ceramic samples of the composition under study were found. It was shown that the effect of ordering of different types of atoms in the cells, leading to the formation of a superstructure and a doubling of the lattice period, was not observed in any of the samples. . Measurements of the dielectric constant of the synthesized samples and the tangent of the dielectric loss angle showed a violation of the Curie-Weiss law, which indicates the diffusion of the phase transition.