Multiedge refinement of extended x-ray-absorption fine structure of manganese zinc ferrite nanoparticles

被引：102

作者：

Calvin, S ^{[1
]}

Carpenter, EE

Ravel, B

Harris, VG

Morrison, SA

机构：

[1] USN, Res Lab, Washington, DC 20375 USA

[2] George Washington Univ, Washington, DC 20052 USA

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.66.224405

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structure of nanoparticle manganese zinc ferrites synthesized by a reverse micellar method is determined by analysis of the extended x-ray-absorption fine structure in combination with other techniques. Both empirical and theoretical standards are employed; manganese, zinc, and iron edges are refined simultaneously. It is determined that samples synthesized under similar conditions sometimes exhibit a markedly different distribution of cations between the available sites in the spinel structure; this in turn causes significant differences in the magnetic properties of the samples. In addition, it is found that the mean-square displacements for manganese-oxygen bonds are consistently higher than for zinc-oxygen bonds, perhaps due to the presence of manganese ions of more than one valence.

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页码：1 / 13

页数：13

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