Theoretical Study of Rhombohedral Nacaf3 Crystal in the Predicted Ferroelectric Phase

Abstract

The calculated results for structural optimization, electronic band structure, total density of states and optical properties of a rhombohedral NaCaF3 compound were discussed using generalized gradient approximation under the density functional theory. According to our calculation, NaCaF3 crystal has a direct band transition. Moreover, optical properties of NaCaF3 were investigated using scissor approximation. This is the first theoretical study of rhombohedral crystal structure of NaCaF3 as far as we know.