1999/07/17 by V. A. Stephanovich, M. D. Glinchuk, Stephanovich, V. A. +4
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Optical and Acousto-Optic Technologies #Solid-state spectroscopy and crystallography #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/9907249
5 pages, RevTeX, 2 figures
arxiv created 1999/07/17 · openalex publication_date 1999/07/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Phase diagram of solid solutions of antiferroelectric and ferroelectric materials like PbZr1-xTixO3 (PZT), Rbx(NH4)1-xH2PO% 4 (RADP) is calculated at the region x≤ 0.1. Antiferroelectric and ferroelectric order parameters (which correspond respectively to the difference and sum of two sublattices ions shifts) were introduced for antiferroelectric host lattice. Small admixture of ferroelectric component was considered as a random electric field source. The influence of this field on both aforementioned order parameters was calculated. Self consistent averaging with calculated random field distribution function made it possible to obtain the system of equations for order parameters of mixed system. The antiferroelectric Ta and ferroelectric Tc phase transition temperature concentrational dependence was expressed through the transition temperatures of the composition and members. The obtained Ta(x) dependence was shown to fit pretty good the observed values for PZT and RADP. The application of the proposed theoretical approach to other types of mixed systems is discussed.