Solid solution between lead fluorapatite and lead fluorvanadate apatite: mixing behavior,Raman feature and thermal expansivity |
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| Authors: | Qiang He Xi Liu Xiaomin Hu Sicheng Li Hejing Wang |
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| Institution: | (1) Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing, 100871, People’s Republic of China;(2) School of Earth and Space Sciences, Peking University, Beijing, 100871, People’s Republic of China; |
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| 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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| Keywords: | |
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