X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

Abstract

The present paper is interested in the study of compounds from the apatite family with the general formula Ca₁₀ (PO₄)₆A₂. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatite

Ca₈ Gd₂ (PO₄)₆O₂ has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.