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

doi:10.1007/s00269-010-0413-0

CORC > 北京大学 > 地球与空间科学学院

	Synthetic lead bromapatite: X-ray structure at ambient pressure and compressibility up to about 20 GPa
	Liu, Xi ; Fleet, Michael E. ; Shieh, Sean R. ; He, Qiang
刊名	physics and chemistry of minerals
	2011
关键词	Lead bromapatite Solid-state synthesis Crystal structure Compressibility Synchrotron powder X-ray diffraction Environment CALCIUM BROMAPATITE POWDER DIFFRACTION CRYSTAL-CHEMISTRY GROUP MINERALS CARBONATE ION B CARBONATE APATITE FLUORAPATITE HYDROXYAPATITE SUBSTITUTION
DOI	10.1007/s00269-010-0413-0
英文摘要	Lead bromapatite [Pb-10(PO4)(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 PO4 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 < 10 GPa) fitted to the third-order Birch-Murnaghan equation yield an isothermal bulk modulus (K (T) ) of 49.8(16) GPa and first pressure derivative (K-T ) of 10.1(10). If K-T is fixed at 4, the derived K (T) is 60.8(11) GPa. The relative difference of the bulk moduli of these two lead apatites is thus about 12%, which is about two times the relative difference of the bulk moduli (similar to 5%) of the calcium apatites fluorapatite [Ca-10(PO4)(6)F-2](,) chlorapatite [Ca-10(PO4)(6)Cl-2] and hydroxylapatite [Ca-10(PO4)(6)(OH)(2)]. Another interesting feature apparently related to the replacement of F by Br in lead apatite is the switch in the principle axes of the strain ellipsoid: the c-axis is less compressible than the a-axis in lead bromapatite but more compressible in lead fluorapatite.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000289572600007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Materials Science, Multidisciplinary; Mineralogy; SCI(E); EI; 6; ARTICLE; 5; 397-406; 38
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155798]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu, Xi,Fleet, Michael E.,Shieh, Sean R.,et al. Synthetic lead bromapatite: X-ray structure at ambient pressure and compressibility up to about 20 GPa[J]. physics and chemistry of minerals,2011.
APA	Liu, Xi,Fleet, Michael E.,Shieh, Sean R.,&He, Qiang.(2011).Synthetic lead bromapatite: X-ray structure at ambient pressure and compressibility up to about 20 GPa.physics and chemistry of minerals.
MLA	Liu, Xi,et al."Synthetic lead bromapatite: X-ray structure at ambient pressure and compressibility up to about 20 GPa".physics and chemistry of minerals (2011).