Infrared-active optical phonons in LiFePO4 single crystals

Publication Type

Journal Article

Date Published

07/2019

Abstract

Infrared-active optical phonons were studied in olivine LiFePO4 oriented single crystals by means of both rotating analyzer and rotating compensator spectroscopic ellipsometry in the spectral range between 50 and 1400 cm−1. The eigenfrequencies, oscillator strengths, and broadenings of the phonon modes were determined from fits of the anisotropic harmonic oscillator model to the data. Optical phonons in a heterosite FePO4 crystal were measured from the delithiated ab-surface of the LiFePO4 crystal and compared with the phonon modes of the latter. Good agreement was found between experimental data and the results of solid-state hybrid density functional theory calculations for the phonon modes in both LiFePO4 and FePO4.

Journal

Journal of Applied Physics

Volume

122

Year of Publication

2017

Issue

4

Pagination

045107

ISSN

0021-8979

Short Title

Journal of Applied Physics

Refereed Designation

Refereed
Organization 
Research Areas