CHARACTERIZATION OF MN7SIO12, A SYNTHETIC EQUIVALENT OF BRAUNITE A NATURAL MINERAL WITH VARIOUS MANGANESE SITES

被引：8

作者：

PALVADEAU, P

EUZEN, P

QUEIGNEC, M

VENIEN, JP

机构：

[1] IPCM, laboratoire de chimie, Solides UMR CNRS 110, 44072 Nantes Cedex 03

来源：

MATERIALS RESEARCH BULLETIN | 1991年 / 26卷 / 09期

关键词：

BRAUNITE; MANGANESE; OXIDE; SILICATE;

D O I：

10.1016/0025-5408(91)90163-G

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A redox reaction between Mn2+Cl2, Mn4+O2 and SiO2 occurs above 600-degrees-C, in sealed tubes, giving a new compound: Mn7SiO12. Crystals have a tetragonal symmetry, space group I4(1)/acd, with a = 9.371(2) angstrom, c = 18.847(8) angstrom, Z = 8. A full structural determination has been realized. Crystallographic data show that Mn7SiO12 is isomorphic to "Braunite", a natural mineral. Manganese atoms exist at two oxydation states (2+ and 3+) and present cubic (Mn2+) and octahedral (Mn3+) coordinations. Preliminary magnetic and infrared characterizations have been performed.

引用

页码：841 / 848

页数：8

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