Reinvestigation of the binary diagram Na3PO4-FePO4 and crystal structure of a new iron phosphate Na3Fe3(PO4)4

被引：29
|
作者：
Lajmi, B
Hidouri, M
Rzeigui, M
Ben Amara, M [1 ]
机构：
[1] Fac Sci Monastir, Dept Chim, Lab Chim Struct Mat, Monastir 5000, Tunisia
[2] Fac Sci Bizerte, Dept Chim, Jarzouna 7021, Tunisia
来源：
MATERIALS RESEARCH BULLETIN | 2002年 / 37卷 / 15期
关键词：
inorganic compounds; layered compound; X-ray diffraction; thermal analysis; crystal structure;
D O I：
10.1016/S0025-5408(02)00940-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A new iron(III) phosphate Na3Fe3(PO4)(4) has been synthesized and characterized. It decomposes before melting at 860degreesC into FePO4 and Na3Fe2(PO4)(3). The structure of the compound was determined by single-crystal X-ray diffraction. The unit cell is monoclinic with the following parameters: a = 19.601(8) Angstrom, b = 6.387(1) Angstrom, c = 10.575(6) Angstrom and beta = 91.81(4)degrees; Z = 4; space group: C2/c. Na3Fe3(PO4)(4) exhibits a layered structure involving corner-linkage between FeO6 octahedra, and corner- and edge-sharing between FeO6 octahedra and PO4 tetrahedra. The Na+ cations occupying the interlayer space are six and seven-fold coordinated by oxygen atoms. The relationship between the structure of Na3Fe3(PO4)(4) and the previous reported hydrate K3Fe3(PO4)(4)H2O will be discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2407 / 2416
页数：10
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