Abstract

This paper analyzes the experimental and theoretical studies of the problem of a diffuse phase transition (PTC) in a composite material xPbSe⋅(1 – x)PbSeO₃, in which x varies from 0 to 1. The decrease in stability in the virtual cubic phase of lead selenide (PbSe) is achieved by oxidizing it with atmospheric oxygen and forming a ferroelectric disordered monoclinic phase of lead selenite (PbSeO₃). The mechanism of lead selenide oxidation by air oxygen is studied by X-ray diffractometry, optical reflection in the infrared region of the spectrum, X-ray emission analysis (the chemical shift method), nuclear magnetic resonance, studies of AC and DC conductivity, differential scanning calorimetry, and other methods. The reason for the smearing of the phase transition in the xPbSe⋅(1 – x)PbSeO₃ composite, in which x varies from 0 to 1, is analyzed based on the previously obtained experimental results of its detection.

中文翻译：

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铁电复合材料xPbSe·(1 – x)PbSeO3结构无序对相变拖尾效应的影响

摘要

本文分析了复合材料x PbSe⋅(1 – x )PbSeO ₃中扩散相变 (PTC) 问题的实验和理论研究，其中x从 0 变化到 1。虚拟稳定性下降硒化铅（PbSe）的立方相是通过将其与大气中的氧氧化并形成铁电无序单斜晶相的亚硒酸铅（PbSeO ₃）。通过X射线衍射、光谱红外区光学反射、X射线发射分析（化学位移法）、核磁共振、交流和直流电导率研究，研究了空气中氧气氧化硒化铅的机理，差示扫描量热法等方法。根据先前获得的检测实验结果，分析了x PbSe⋅(1 – x )PbSeO ₃复合材料（其中x从0变化到1）中相变拖尾的原因。