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

被引：13

作者：

Buryy, O. ^{[1
]}

Zhydachevskii, Ya ^{[1
]}

Vasylechko, L. ^{[1
]}

Sugak, D. ^{[2
]}

Martynyuk, N. ^{[1
]}

Ubizskii, S. ^{[1
]}

Becker, K. D. ^{[3
]}

机构：

[1] Lviv Polytech Natl Univ, UA-79013 Lvov, Ukraine

[2] Sci Res Co Carat, R&D Inst Mat, UA-79031 Lvov, Ukraine

[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys & Theoret Chem, D-38106 Braunschweig, Germany

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 05期

关键词：

CHARGE-TRANSFER LUMINESCENCE; IN-SITU; POWDER DIFFRACTION; OXIDATION; KINETICS; YALO3;

D O I：

10.1088/0953-8984/22/5/055902

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The paper presents experimental results of investigations on the influence of temperature and thermo-chemical annealing on the structural and optical properties of YbAlO3 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 YbAlO3 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.

引用

页数：7

共 24 条

[1] Akselrud L.G., 1993, MAT SCI FORUM, V133-136, P335
[2] [Anonymous], [No title captured]
[3] AN EMPIRICAL CORRECTION FOR ABSORPTION ANISOTROPY
BLESSING, RH
[J]. ACTA CRYSTALLOGRAPHICA SECTION A, 1995, 51 : 33 - 38
[4] Ytterbium-based scintillators, a new class of inorganic scintillators for solar neutrino spectroscopy
Chipaux, R
Cribier, M
Dujardin, C
Garnier, N
Guerassimova, N
Mallet, J
Meyer, JP
Pédrini, C
Petrosyan, AG
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 486 (1-2) : 228 - 233
[5] CRYOSTAT FOR SYNCHROTRON POWDER DIFFRACTION WITH SAMPLE ROTATION AND CONTROLLED GAS ATMOSPHERE IN THE SAMPLE CHAMBER
IHRINGER, J
KUSTER, A
[J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1993, 26 (pt 1) : 135 - 137
[6] Computer modelling of defects and transport in perovskite oxides
Islam, MS
[J]. SOLID STATE IONICS, 2002, 154 : 75 - 85
[7] The synchrotron powder diffractometer at beamline B2 at HASYLAB/DESY: status and capabilities
Knapp, M
Baehtz, C
Ehrenberg, H
Fuess, H
[J]. JOURNAL OF SYNCHROTRON RADIATION, 2004, 11 : 328 - 334
[8] Knapp M, 2004, NUCL INSTRUM METH A, V521, P565, DOI 10.1016/j.nima.2003.10.100
[9] An optical in-situ study of the re-oxidation kinetics of mixed valent Yb3Al5O12
Kreye, M
Becker, KD
[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2003, 5 (11) : 2283 - 2290
[10] Martynyuk NV, 2005, PHYS STATUS SOLIDI C, V2, P330, DOI 10.1002/pssc.200460177

← 1 2 3 →