Фазовые состояния твердого раствора (1-x)PbFe-=SUB=-0.5-=/SUB=-Nb-=SUB=-0.5-=/SUB=-O-=SUB=-3-=/SUB=--xPbTiO-=SUB=-3-=/SUB=-. Описание на основе многоминимумных моделей

Физика твердого тела Pub Date : 2023-01-01 DOI:10.21883/ftt.2023.04.55292.543

М.П. Ивлиев, С. И. Раевская, Виктор Валериевич Титов, И. П. Раевский, М. А. Малицкая

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Abstract

Based on the composition of two multiminimum models, a statistical model has been developed on the basis of which the formation of tetragonal and monoclinic ferroelectric phases in a solid solution (1-x)PbFe0.5Nb0.5O3-xPbTiO3 has been investigated and described. By selecting the parameters of the model, it was possible to reproduce the diagram T(x) of this solid solution. The peculiarity of the diagram is that when approaching the concentration of x~0.1, the temperatures of the phase transitions between the tetragonal and monoclinic phases decrease sharply, turning to zero. It is shown that the disappearance of the monoclinic phase is due to the specifics of the statistical properties of the eight-minimum model describing the subsystem of octahedra with eight minima. The features of the thermodynamic properties of a solid solution in the vicinity of the morphotropic boundary between the tetragonal and monoclinic phases are also investigated

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相位固溶体状态(1 - x) PbFe = SUB - 0.5 = / SUB - Nb = SUB - 0.5 = / SUB - O = SUB - 3 = / SUB - - xPbTiO = SUB = - 3 = / SUB。多值模型描述

基于两个多最小模型的组合，建立了一个统计模型，在此基础上研究和描述了(1-x)PbFe0.5Nb0.5O3-xPbTiO3固溶体中四方和单斜铁电相的形成。通过选择模型的参数，可以重现该固溶体的图T(x)。该图的特点是，当浓度接近x~0.1时，四方相和单斜相之间的相变温度急剧下降，趋于零。结果表明，单斜相的消失是由于描述具有8个最小值的八面体子系统的八极小模型的统计特性的特殊性。研究了四方相和单斜相晶界附近固溶体的热力学性质

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Физика твердого тела

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