Phase transitions and optical absorption edge in (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals

被引：7
|
作者：
Studenyak, I. P. [1 ]
Izai, V. Yu [1 ]
Studenyak, V. I. [1 ]
Rybak, S. O. [1 ]
Pogodin, A. I. [1 ]
Kokhan, O. P. [1 ]
Kranjcec, M. [2 ]
机构：
[1] Uzhgorod Natl Univ, 46 Pidhirna Str, UA-88000 Uzhgorod, Ukraine
[2] Univ North, 33 J Krizanica St, Varazhdin 642000, Croatia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 735卷
关键词：
Inorganic compounds; Crystal growth; Phase transitions; Optical properties; THERMOCHEMICAL DATA; IONIC CONDUCTORS; CU6PS5X X; BR; CL; TEMPERATURE; HAL;
D O I：
10.1016/j.jallcom.2017.11.144
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
(Cu6PS5Br)(1-x)(Cu7PS6)(x) mixed crystals were grown by chemical vapour transport. Low-temperature isoabsorption and polarisation studies of phase transitions (PT) were performed. A second-order PT characterized by appearance of light transmission in the polariser-crystal-analyser system and a typical knee at the isoabsorption dependence, is clearly revealed. With increasing Cu7PS6 content in (Cu6PS5Br)(1-x)(Cu7PS6)(x) mixed crystals, the second-order PT shifts down in temperature range and becomes smeared. Temperature behaviour of the optical absorption edge is studied in the temperature interval 77-320 K. In the superionic phase the absorption edge has an exponential shape and a characteristic Urbach bundle is observed. In the vicinity of the second-order PT, a variation of the Urbach absorption edge parameters and exciton-phonon interaction is revealed. Influence of compositional disordering on the parameters of the Urbach absorption edge, exciton-phonon interaction parameters, and the PT temperatures is studied. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：417 / 421
页数：5
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