Vibrational Properties of Calcium Phosphate Compounds. 1. Raman Spectrum of β-Tricalcium Phosphate

Abstract

We present a study of the Raman spectrum of polycrystalline β-Ca3(PO4)2 (β-TCP) over its whole optical frequency range. Raman scattering bands associated with the normal vibrational modes of the PO43- tetrahedron were clearly identified, confirming the molecular character of the β-TCP crystal as regards to its vibrational properties. External lattice modes involving Ca2+ and PO43- sublattices were also observed. Several characteristic features of the spectrum are discussed in relation to the crystallographic structure of β-TCP.