Raman spectroscopic study of barium fluorapatite

Carl E. Bonner Jr.; Chahn C. Chess; Chandana Meegoda; Sennay Stefanos; George B. Loutts; George E. Miller III

doi:10.1117/12.349236

26 May 1999 Raman spectroscopic study of barium fluorapatite

Carl E. Bonner Jr., Chahn C. Chess, Chandana Meegoda, Sennay Stefanos, George B. Loutts, George E. Miller III

Proceedings Volume 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices; (1999) https://doi.org/10.1117/12.349236
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

The vibrations of phosphate (PO₄^-3) ions in single crystals of hexagonal Ba₅(PO₄)₃F have been investigated by means of polarized Raman scattering and compared to Raman frequencies observed in fluorapatite analogs Sr₅(PO₄)₃F and Ca₅(PO₄)₃F. The Raman vibrational frequencies decrease upon substitution of Ba²⁺ for Sr²⁺ or Ca²⁺ in the lattice, asymptotically approaching the Raman frequencies for vibrations of the free ion. The observed splitting is in accord with predictions made by a group theory analysis of the factor group of the unit cell. The effects of the host lattice environment on the magnitude of the Davydov splittings and frequency shifts of phosphate ions within different crystals with the fluorapatite structure are demonstrated to be inversely proportional to the unit cell volume.

Citation Download Citation

Carl E. Bonner Jr., Chahn C. Chess, Chandana Meegoda, Sennay Stefanos, George B. Loutts, and George E. Miller III "Raman spectroscopic study of barium fluorapatite", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); https://doi.org/10.1117/12.349236

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