Crystal structure analysis and high-temperature phase transitions of complex rare-earth perovskite, La2(Al1/2MgTa1/2)O6

Sohn, Y.J. and Mauer, G. and Roth, G. and Guillon, O. and Vaßen, R.

Volume: 103 Pages: 1404-1413
DOI: 10.1111/jace.16740
Published: 2020

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, La2(Al1/2MgTa1/2)O6 (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, P21/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 (Formula presented.). On further heating, LAMT transforms to the ideal cubic phase at ~1390°C with the space group symmetry (Formula presented.). 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. © 2019 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals, Inc. on behalf of American Ceramic Society (ACERS)

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