Low Temperature Crystal Structure Behaviour of Complex Yttrium Aluminium Oxides YAlO3 and Y3Al5O12

被引：18

作者：

Senyshyn, A. ^{[1
]}

Vasylechko, L. ^{[2
]}

机构：

[1] Tech Univ Munich, Forsch Neutronenequelle Heinz Maier Leibnitz FRM, D-85748 Garching, Germany

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

来源：

ACTA PHYSICA POLONICA A | 2013年 / 124卷 / 02期

关键词：

THERMAL-EXPANSION; THIN-FILMS; REFRACTIVE-INDEX; ND-YAG; LASER; GROWTH; GALLIUM; RANGE; SPECTROSCOPY; COEFFICIENTS;

D O I：

10.12693/APhysPolA.124.329

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Crystal structures of two yttrium aluminium oxides, namely YAlO3 and Y3Al5O12, were investigated in the temperature range 3.4-300 K by high-resolution neutron powder diffraction. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Thermal expansion of yttrium aluminium oxides was evaluated in terms of 1st order Gruneisen approximation, where the Debye temperatures and the Gruneisen parameters have been estimated for both compositions. Anomalies in the thermal expansion of yttrium aluminium perovskite have been observed and modelled using the Einstein oscillator with negative Gruneisen parameter. Extended bond length analysis revealed significant thermally-driven modifications of the aluminium oxygen framework.

引用

页码：329 / 335

页数：7

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