Crystal structure and spectroscopic properties of a new oxyarsenate Li0.5Ni0.25TiOAsO4

被引：3

作者：

Chakir, M. ^{[1
]}

El Jazouli, A.

Chaminade, J. P.

Bouree, F.

de Waal, D.

机构：

[1] Univ Hassan 2, Lab Chim Mat Solides, Mohammedia Fac Sci, Casablanca, Morocco

[2] Univ Bordeaux 1, CNRS, ICMCB, UPR 9048, F-33608 Pessac, France

[3] CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France

[4] Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa

来源：

MATERIALS RESEARCH BULLETIN | 2007年 / 42卷 / 07期

关键词：

inorganic compounds; Raman spectroscopy; crystal structure; optical properties;

D O I：

10.1016/j.materresbull.2006.10.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The new oxyarsenate Li(0.5)Ni(0.25)TiOASO(4) has been synthesized and studied by a combination of X-ray powder diffraction, neutrons powder diffraction and vibrational spectroscopy. Li0.5Ni0.25TiOAsO4 crystallizes in the monoclinic P2(1)/c space group with the unit cell parameters: a = 6.5854(3) angstrom, b = 7.4665(4) angstrom, c = 7.4969(4) angstrom, beta = 89.884(6)degrees, V= 368.62(1) angstrom(3) and Z = 4. The structure has been determined at room temperature from neutrons diffraction by the Rietveld method analysis. It is formed by a 3D network of TiO6 octahedra and AsO4 tetrahedra sharing corners. Structural refinement shows a partial and a statistical occupancy of 2a and 2b sites by Li+ and Ni2+ ions. TiO6 octahedra are linked together by corners and form infinite chains along c-axis. Raman and infrared studies confirm the existence of -Ti-O-Ti- chains. Diffuse reflectance spectrum indicates the presence of octahedrally coordinated Ni2+ ions. (C) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1348 / 1356

页数：9

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