Abstract
The solid solution between lead fluorapatite and lead fluorvanadate apatite, Pb10[(PO4)6-x (VO4) x ]F2 with x equal to 0, 1, 2, 3, 4, 5 and 6, was synthesized by solid-state reaction at 1 atm and 700°C for 72 h and characterized by scanning electronic microprobe, electronic microprobe analysis, micro-Raman spectroscopy, and powder X-ray diffraction. The volume-composition relationship at ambient temperature does not show significant deviation from the Vegard’s Law. The Raman spectrum data suggest that both P and V are identical on a C s site and both end-members show no apparent factor-group effect. The Raman frequency shift of the symmetric stretching vibration is linearly dependent on the composition. High temperature X-ray diffraction data, up to 600°C, suggest that the thermal expansion coefficients α a , α c , and α V also vary linearly with the compositions of the apatites.
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We are grateful to two anonymous reviewers and Professor M. Matsui who provided critical comments on the manuscript. We thank the National Natural Science Foundation of China (Grant 40872033) for financial support.
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He, Q., Liu, X., Hu, X. et al. Solid solution between lead fluorapatite and lead fluorvanadate apatite: mixing behavior, Raman feature and thermal expansivity. Phys Chem Minerals 38, 741–752 (2011). https://doi.org/10.1007/s00269-011-0447-y
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DOI: https://doi.org/10.1007/s00269-011-0447-y