Infrared-active optical phonons in LiFePO4 single crystals
- New Jersey Inst. of Technology, Newark, NJ (United States)
- Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Stony Brook Univ., NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
- Univ. of Cambridge (United Kingdom)
Infrared-active optical phonons were studied in olivine LiFePO oriented single crystals by means of both rotating analyzer and rotating compensator spectroscopic ellipsometry in the spectral range between 50 and 1400 cm . 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 crystal were measured from the delithiated ab-surface of the LiFePO 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 and FePO . 4 4 4 4 4 -1
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; AC02-05CH11231; AC02-98CH10886; FG02-07ER46382; SC0001294
- OSTI ID:
- 1425022
- Alternate ID(s):
- OSTI ID: 1372950; OSTI ID: 1772905
- Report Number(s):
- BNL-200004-2018-JAAM; TRN: US1802004
- Journal Information:
- Journal of Applied Physics, Vol. 122, Issue 4; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | September 2018 |
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