Maximum substitution of magnesium for calcium sites in Mg-β-TCP structure determined by X-ray powder diffraction with the Rietveld refinement

被引：38

作者：

Araujo, J. C. ^{[2
]}

Sader, M. S. ^{[1
]}

Moreira, E. L. ^{[3
]}

Moraes, V. C. A. ^{[3
]}

LeGeros, R. Z. ^{[4
]}

Soares, G. A. ^{[1
]}

机构：

[1] UFRJ, BR-21941972 Rio De Janeiro, Brazil

[2] Univ Estado Rio De Janeiro, FFP, BR-24435000 Rio De Janeiro, Brazil

[3] CBPF, BR-22290180 Rio De Janeiro, Brazil

[4] NYU, Coll Dent, New York, NY 10010 USA

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2009年 / 118卷 / 2-3期

关键词：

beta-TCP; Magnesium; Calcium phosphate; Rietveld method; Structural characterization; STABILIZING IMPURITY; CRYSTAL-STRUCTURE; BETA-CA3(PO4)2; HYDROXYAPATITE;

D O I：

10.1016/j.matchemphys.2009.07.064

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The purpose of this study was to determine the maximum substitution of magnesium, Mg2+, for calcium, Ca2+ sites in a beta-tricalcium phosphate (Mg-beta-TCP) powder using the Rietveld method. Ca-deficient apatite with a theoretical 0.2 Mg/Ca ratio was synthesized and the resultant powder sintered at 1000 degrees C for 4 h. The maximum Mg2+ substitution of nearly 15 mol% in beta-TCP structure was deduced from the occupancy factors. The analysis indicated that the maximum substitution of Mg2+ on the M(4) and M(5) sites was, approximately, 4.21 and 10.72 mol%, corresponding to the Ca-2.61(Mg1(0.28), Mg2(0.11))(PO4)(2) stoichiometric formula. A small displacement of the Ca atoms position was observed around the Mg1(5)PO4 octahedral, and their increasing shift to the PO4 triangles corners. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：337 / 340

页数：4

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