The full phase diagram of (Ga1%xInx)2O3 is obtained theoretically. The phases competing for the ground state are monoclinic β (low x), hexagonal (x > 0.5), and bixbyite (large x). Three disconnected mixing regions interlace with two distinct phase-separation regions, and at x > 0.5, the coexistence of hexagonal and β alloys with phase-separated binary components is expected. We also explore the permanent polarization of the phases, but none of them are polar. On the other hand, we find that ε-Ga2O3, which was stabilized in recent experiments, is pyroelectric with a large polarization and piezoelectric coupling, and could be used to produce high-density electron gases at interfaces.

Phase diagram and polarization of stable phases of (Ga1− x In x )2O3

MACCIONI, MARIA BARBARA;FIORENTINI, VINCENZO
2016

Abstract

The full phase diagram of (Ga1%xInx)2O3 is obtained theoretically. The phases competing for the ground state are monoclinic β (low x), hexagonal (x > 0.5), and bixbyite (large x). Three disconnected mixing regions interlace with two distinct phase-separation regions, and at x > 0.5, the coexistence of hexagonal and β alloys with phase-separated binary components is expected. We also explore the permanent polarization of the phases, but none of them are polar. On the other hand, we find that ε-Ga2O3, which was stabilized in recent experiments, is pyroelectric with a large polarization and piezoelectric coupling, and could be used to produce high-density electron gases at interfaces.
polarization; phase stability; gallium oxide
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11584/212764
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