Infrared-active optical phonons in LiFePO4 single crystals

Infrared-active optical phonons in LiFePO4 single crystals

TitleInfrared-active optical phonons in LiFePO4 single crystals
Publication TypeJournal Article
Year of Publication2017
AuthorsT. N Stanislavchuk, D. S Middlemiss, Jaroslaw S Syzdek, Y. Janssen, R. Basistyy, A. A Sirenko, Peter G Khalifah, Clare P Grey, Robert Kostecki
JournalJournal of Applied Physics
Volume122
Issue4
Pagination045107
Date Published07/2019
ISSN0021-8979
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.

DOI10.1063/1.4995282
Short TitleJournal of Applied Physics
Refereed DesignationRefereed