# Lattice dynamics in improper ferroelectric YGaO3

Andryushin, N. D.; Pavlovskiy, M. S.; Zinenko, V. I. Ferroelectrics. doi.org/10.1080/00150193.2020.1791584

The structural phase transition *P*6_{3}/*mmc* → *P*6_{3}*cm* in hexagonal YGaO_{3} crystal is studied by first-principles methods. From lattice dynamics calculations it was obtained that the mechanism of transition into polar phase is similar to the one in isostructural YMnO_{3} crystal. As a result of calculations the improper ferroelectricity and electrical polarization were revealed in YGaO_{3}.