Synthesis and crystal structure of Ca9Cu1.5(PO4)7 and reinvestigation of Ca9.5Cu(PO4)7

被引：35

作者：

Belik, AA ^{[1
]}

Yanov, OV ^{[1
]}

Lazoryak, BI ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia

来源：

MATERIALS RESEARCH BULLETIN | 2001年 / 36卷 / 10期

基金：

俄罗斯基础研究基金会;

关键词：

inorganic compounds; chemical synthesis; X-ray diffraction; crystal structure;

D O I：

10.1016/S0025-5408(01)00666-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ca9Cu1.5(PO4)(7) was synthesized by the solid-state method at 1273 K followed by quenching in air. Crystal structure of Ca9Cu1.5(PO4)(7) was refined by the Rietveld method: space group R3c, a = 10.3379(1) Angstrom, c = 37.1898(3) Angstrom, Z = 6 with R-wp = 4.87%, R-p = 3.67%, S = 1.58, R-I = 2.42%, R-F = 1.07%. The structure of Ca9Cu1.5(PO4)(7) is isotypic with beta -Ca-3(PO4)(2) and Ca9.5Cu(PO4)(7). The M(5) site is fully occupied, and the M(4) site is half occupied by copper canons. The M(1)-M(3) sites are occupied by calcium canons. Copper canons in the M(4) site are displaced from the threefold axis due to long distances M(4)-O. Reinvestigation of crystal structure of Ca9.5Cu(PO4)(7) showed that the M(5) site is occupied by 0.79(1)Cu2+ + 0.21Ca(2+), and other copper canons locate in the M(4) site. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：1863 / 1871

页数：9

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