Abstract
The synthetic solid solutions 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, were compressed up to about 9 GPa at ambient temperature by using a diamond-anvil cell coupled with synchrotron X-ray radiation. A second-order Birch–Murnaghan equation of state was used to fit the data. As the substitution of the PO4 3− cations by the VO4 3− cations progresses, the isothermal bulk modulus steadily decreases, with a maximum reduction of about 16% (from 68.4(16) GPa for Pb10(PO4)6F2 to 57.2(28) GPa for Pb10(VO4)6F2). For the entire composition range, the a-axis dimension remains more compressible than the c-axis dimension, with the ratio of the axial bulk moduli (K T−c :K T−a ) larger than 1. The ratio of K T−c to K T−a increases from about 1.04(4) to 1.23(14) as the composition parameter x increases from 0 to 6, suggesting that the apatite solid solutions Pb10[(PO4)6−x (VO4) x ]F2 become more elastically anisotropic.
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Acknowledgments
We are grateful to two anonymous reviewers and Professor M. Matsui who provided us with constructive comments which substantially improved the quality of our paper. We thank the National Natural Science Foundation of China (Grant 40872033 and 41090371) for financial support.
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He, Q., Liu, X., Hu, X. et al. Solid solutions between lead fluorapatite and lead fluorvanadate apatite: compressibility determined by using a diamond-anvil cell coupled with synchrotron X-ray diffraction. Phys Chem Minerals 39, 219–226 (2012). https://doi.org/10.1007/s00269-011-0477-5
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DOI: https://doi.org/10.1007/s00269-011-0477-5