First-principles investigation of LaGaO3 and LaInO3 lanthanum perovskite oxides

Date

2016-01-01

Author

Erkisi, Aytac
GÖKOĞLU, GÖKHAN
Sürücü, Gökhan
Ellialtioglu, Recai
Yildirim, Erdem Kamil

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Among the class of ABO(3)-type perovskite oxides, LaMO3 (M=Ga and In) compounds are investigated in cubic (Pm-3m), tetragonal (P4mm), hexagonal (P-3m1), rhombohedral (R-3c) and orthorhombic (Pbnm) phases using generalised gradient approximation (GGA) within the density functional theory. On-site Coulomb interaction is also included in the calculations (GGA+U). After the determination of the stable phase, phase transition pressures have also been calculated. Then, their full structural, mechanical, electronic, optical and vibrational properties have been studied in stable orthorhombic (Pbnm) phase. Both compounds are non-magnetic insulators in their ground states. The energy gaps (E-g) of LaGaO3 and LaInO3 compounds have been found as 3.14 and 2.55eV, respectively. The calculated elastic constants and phonon dispersion curves confirm the stability of orthorhombic phase mechanically and dynamically.

URI

https://hdl.handle.net/11511/88978

Journal

PHILOSOPHICAL MAGAZINE

DOI

https://doi.org/10.1080/14786435.2016.1189100

Collections

Department of Physics, Article

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Citation Formats

A. Erkisi, G. GÖKOĞLU, G. Sürücü, R. Ellialtioglu, and E. K. Yildirim, “First-principles investigation of LaGaO3 and LaInO3 lanthanum perovskite oxides,” PHILOSOPHICAL MAGAZINE, pp. 2040–2058, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/88978.