Thermal changes of the crystal structure and the influence of thermo-chemical annealing on the optical properties of YbAlO3 crystals

The paper presents experimental results of investigations on the influence of temperature and thermo-chemical annealing on the structural and optical properties of YbAlO(3) crystals. Thermal behaviour of the crystal structure has been studied in the temperature range of 19-1173 K by means of in situ...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-02, Vol.22 (5), p.055902-055902
Main Authors: Buryy, O, Zhydachevskii, Ya, Vasylechko, L, Sugak, D, Martynyuk, N, Ubizskii, S, Becker, K D
Format: Article
Language:English
Subjects:
Anisotropy
Annealing
ANNEALING PROCESSES
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CRYSTAL STRUCTURE
Diffraction
Exact sciences and technology
MICA
Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Oxidation
Physics
PROPERTIES
Reduction
SUPERCONDUCTORS
YTTRIUM OXIDE
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The paper presents experimental results of investigations on the influence of temperature and thermo-chemical annealing on the structural and optical properties of YbAlO(3) crystals. Thermal behaviour of the crystal structure has been studied in the temperature range of 19-1173 K by means of in situ high-resolution x-ray powder diffraction using synchrotron radiation. Lattice expansion of YbAlO(3) displays a strongly anisotropic character: the relative expansion along the b direction is about two times smaller than that along the a and c axes. The influence of thermo-chemical annealing in oxidizing and reducing atmospheres has been studied by means of in situ optical spectroscopy. The increase of the absorption in the range of 300-600 nm during annealing in an oxidizing atmosphere as well as its bleaching during reduction has been observed in the temperature range 700-1000 K. The oxidation and reduction kinetics have been analysed by means of mathematical models taking into account diffusion and the quasi-chemical reaction of the defect centres.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/5/055902