@article{32134,
  author = {T N Stanislavchuk and D S Middlemiss and Jaroslaw S Syzdek and Y Janssen and R Basistyy and A A Sirenko and Peter G Khalifah and Clare P Grey and Robert Kostecki},
  title = {Infrared-active optical phonons in LiFePO<sub>4</sub> single crystals},
  abstract = {<p><span>Infrared-active optical phonons were studied in olivine LiFePO</span><sub><span>4</span></sub><span>&nbsp;oriented single crystals by means of both rotating analyzer and rotating compensator spectroscopic ellipsometry in the spectral range between 50 and 1400&thinsp;cm</span><sup><span>−1</span></sup><span>. 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 FePO</span><sub><span>4</span></sub><span>&nbsp;crystal were measured from the delithiated&nbsp;</span><em>ab</em><span>-surface of the LiFePO</span><sub><span>4</span></sub><span>&nbsp;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 LiFePO</span><sub><span>4</span></sub><span>&nbsp;and FePO<sub>4</sub>.</span></p>},
  year = {2017},
  journal = {Journal of Applied Physics},
  volume = {122},
  pages = {045107},
  month = {07/2019},
  issn = {0021-8979},
  doi = {10.1063/1.4995282},
  language = {eng},
}