The solubility of Co in TiO2 anatase and rutile and its effect on the magnetic properties

被引：19

作者：

Fleischhammer, Meike ^{[1
]}

Panthoefer, Martin ^{[1
]}

Trernel, Wolfgang ^{[1
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Anorgan & Analyt Chem, D-55099 Mainz, Germany

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 04期

关键词：

TiO2; Ferromagnetism; Co doping; ROOM-TEMPERATURE FERROMAGNETISM; THIN-FILMS; EPITAXIAL-GROWTH;

D O I：

10.1016/j.jssc.2009.01.011

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学];

摘要：

Co-doped anatase and rutile bulk-samples prepared by the sol-gel technique are found to be paramagnetic at room-temperature. Only further annealing in Ar/H-2 gas results in a ferromagnetic behavior. X-ray diffraction and electron-microscope studies reveal for low doping levels <4% the formation of Co-doped rutile samples and the formation of CoTiO3 as a new phase. Co3O4 can be detected in anatase samples with Co doping levels >= 4%. The observed Co oxides are reduced by Ar/H2 to Co metal. The room-temperature ferromagnetism can therefore be traced back to a segregation of metallic Co. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：942 / 947

页数：6

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