Structure of AFeTi(PO4)3 (A = Mn, Sr) Nasicon-type phases

被引：3
作者：
Aatiq, A [1 ]
Dhoum, H [1 ]
机构：
[1] Fac Sci Ben MSik, Lab Chim Mat Solides, Casablanca, Morocco
来源：
ANNALES DE CHIMIE-SCIENCE DES MATERIAUX | 2006年 / 31卷 / 01期
关键词：
D O I：
10.3166/acsm.31.31-38
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
AFeTi(PO4)(3) (A= Mn, Sr) materials were obtained by solid state reaction in air at 1000 degrees C. The structures of the two compounds were determined from X-ray powder diffraction data (XRD) using Rietveld analysis. Both phases exhibit the Nasicon-type structure (R 3 c space group) with a statistical Fe(Ti) distribution within the framework. Their hexagonal cell parameters are : a(hex). = 8.529(1) angstrom, C-hex. = 20.950(2) angstrom and a(hex). = 8.443(1) angstrom, C-hex = 22.543(2) angstrom, for MnFeTi(PO4)(3) and SrFeTi(PO4)(3), respectively. Sr atoms occupy only the M1 site in SrFeTi(PO4)(3). From XRD data, it is difficult to distinguish without ambiguity between Mn2+, Fe3+ and Ti4+ ions in MnFeTi(PO4)(3). Nevertheless from the cation-anion distance values found from the structure determination, the Mn2+ distribution within the M I site of Nasicon structure is validated.
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页码：31 / 38
页数：8
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