Synthetic lead bromapatite: X-ray structure at ambient pressure and compressibility up to about 20 GPa

Lead bromapatite [Pb 10 (PO 4 ) 6 Br 2 ] has been synthesized via solid-state reaction at pressures up to 1.0 GPa, and its structure determined by single-crystal X-ray diffraction at ambient temperature and pressure. The large bromide anion is accommodated in the c -axis channel by lateral displacem...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2011-05, Vol.38 (5), p.397-406
Main Authors: Liu, Xi, Fleet, Michael E., Shieh, Sean R., He, Qiang
Format: Article
Language:English
Subjects:
AMBIENT TEMPERATURE
ANIONS
Apatite
APATITES
BROMIDES
Bulk modulus
CALCIUM
CATIONS
Chemical synthesis
COMPRESSIBILITY
CRYSTAL STRUCTURE
Crystallography and Scattering Methods
Crystals
Diamonds
Earth and Environmental Science
Earth Sciences
Fluorapatite
Geochemistry
GEOSCIENCES
Hydroxyapatite
Lateral displacement
Mineral Resources
Mineralogy
Original Paper
Pressure
Single crystals
STRAINS
Structural members
Synchrotron radiation
SYNCHROTRONS
SYNTHESIS
Temperature
Tetrahedra
X-RAY DIFFRACTION
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Summary:Lead bromapatite [Pb 10 (PO 4 ) 6 Br 2 ] has been synthesized via solid-state reaction at pressures up to 1.0 GPa, and its structure determined by single-crystal X-ray diffraction at ambient temperature and pressure. The large bromide anion is accommodated in the c -axis channel by lateral displacements of structural elements, particularly of Pb2 cations and PO 4 tetrahedra. The compressibility of bromapatite was also investigated up to about 20.7 GPa at ambient temperature, using a diamond-anvil cell and synchrotron X-ray radiation. The compressibility of lead bromapatite is significantly different from that of lead fluorapatite. The pressure–volume data of lead bromapatite ( P  
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-010-0413-0