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Crystal structure analysis and high‐temperature phase transitions of complex rare‐earth perovskite, La 2 (Al 1/2 MgTa 1/2 )O 6
Author(s) -
Sohn Yoo Jung,
Mauer Georg,
Roth Georg,
Guillon Olivier,
Vaßen Robert
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16740
Subject(s) - monoclinic crystal system , crystallography , rietveld refinement , perovskite (structure) , crystal structure , differential scanning calorimetry , bond length , phase transition , atmospheric temperature range , phase (matter) , crystal (programming language) , octahedron , materials science , space group , chemistry , x ray crystallography , diffraction , condensed matter physics , thermodynamics , physics , optics , organic chemistry , computer science , programming language
In situ high‐temperature powder X‐ray diffraction analysis (HT‐XRD) was carried out in the temperature range from 25°C‐1430°C to investigate the crystal structure of double perovskites, La 2 (Al 1/2 MgTa 1/2 )O 6 (LAMT) and its phase transitions. This complex perovskite is a promising candidate for application in thermal barrier coating systems. Rietveld analysis shows a rock‐salt type ordering of the B ‐site cations in the monoclinic space group symmetry, P 2 1 / n at room temperature. Upon heating, a structural phase transition occurs at ~855°C, and the crystal structure becomes rhombohedral with the space group symmetry R 3 ¯ . On further heating, LAMT transforms to the ideal cubic phase at ~1390°C with the space group symmetry F m 3 ¯ m . Both of the structural phase transitions are completely reversible, and were confirmed through complementary differential scanning calorimetry and thermogravimetry measurements. With increasing temperature, the degree of the octahedral tilting decreases and the variance of the different B –O bond lengths is reduced, until in the cubic phase, no tilting is present, and almost equal B –O bond lengths are obtained.