MOSSBAUER STUDIES IN AN EXTERNAL-FIELD OF WELL-CRYSTALLIZED AL-MAGHEMITES MADE FROM HEMATITE

被引：16

作者：

BOWEN, LH ^{[1
]}

DEGRAVE, E ^{[1
]}

BRYAN, AM ^{[1
]}

机构：

[1] STATE UNIV GHENT,MAGNETISM LAB,B-9000 GHENT,BELGIUM

来源：

HYPERFINE INTERACTIONS | 1994年 / 94卷 / 1-4期

关键词：

D O I：

10.1007/BF02063726

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

A series of hematites with up to 15 mol% Al substitution was converted to maghemites by reduction in the presence of organic matter, followed by slow oxidation. The maghemites formed were Studied by Mossbauer spectroscopy in an external field of 60 kOe at 4 K. This technique allows the determination of site occupancy as well as the canting angle. The spectra are in agreement with a model having both vacancies and Al only in the octahedral sites and small canting angles for both sites. A small dipolar field at the tetrahedral sites was required to fit the line shape. The data indicate that about 10 mol% Al may be a solubility limit in maghemite.

引用

页码：1977 / 1982

页数：6

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