An investigation of the structural dynamics in the fast ionic conductor Cu2-δSe using neutron scattering

被引：15

作者：

Danilkin, S. A. ^{[1
]}

机构：

[1] Australian Nucl Sci & Technol Org, Bragg Inst, Lucas Heights, NSW 2234, Australia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 467卷 / 1-2期

关键词：

Ionic conduction; Crystal structure; Neutron scattering; Diffraction; HIGH-TEMPERATURE PHASES; X-RAY; CATION DISTRIBUTION; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; COPPER SELENIDE; CU2SE; DIFFRACTION; CU1.8SE;

D O I：

10.1016/j.jallcom.2007.12.064

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：

Energy resolved neutron diffraction measurements were performed on Cu1.75Se and Cu1.98Se samples for both alpha- and beta-phases. In-situ Measurements of the Cu1.98Se compound during heating show that the beta-alpha phase transition takes place at 420K and has noticeable temperature hysteresis. In addition to Bragg reflections, the diffraction patterns of the alpha-Cu1.75Se at RT and alpha-Cu1.98Se at 435 K samples taken in conventional two-axis geometry show a broad maximum related to diffuse scattering. This diffuse background is suppressed in the energy resolved experiment which indicates a strong contribution from inelastic scattering coming from correlated thermal displacements of the ions in the super-ionic phase. On the other hand, the diffraction pattern of the non super-ionic beta-phase shows only minor differences between spectra measured with and without the analyser crystal. Crown Copyright (C) 2007 Published by Elsevier B.V. All rights reserved.

引用

页码：509 / 513

页数：5

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