Journal
ACTA PHYSICA POLONICA A
Volume 124, Issue 2, Pages 329-335Publisher
POLISH ACAD SCIENCES INST PHYSICS
DOI: 10.12693/APhysPolA.124.329
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- German Federal Ministry of Education and Research (BMBF) [03FU7DAR]
- Ukrainian Ministry of Education and Sciences
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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.
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