Flux growth of ZnO crystals doped by transition metals

被引:11
|
作者
Sofer, Zdenek [1 ]
Sedmidubsky, David [1 ]
Huber, Stepan [1 ,2 ]
Hejtmanek, Jiri [2 ]
Marysko, Miroslav [2 ]
Jurek, Karel [2 ]
Mikulics, Martin [3 ,4 ]
机构
[1] Inst Chem Technol, Dept Inorgan Chem, CR-16628 Prague 6, Czech Republic
[2] Acad Sci Czech Republ, Inst Phys, CR-16200 Prague 6, Czech Republic
[3] Forschungszentrum Julich, Inst Bio & Nanosyst IBN 1, D-52425 Julich, Germany
[4] JARA, Fundamentals Future Informat Technol, Julich, Germany
关键词
Growth from high temperature solutions; Oxides; Zinc compounds; Magnetic materials; Semiconducting II-VI materials; ROOM-TEMPERATURE PHOTOLUMINESCENCE; THIN-FILMS; SINGLE-CRYSTALS; FERROMAGNETISM; BULK; KOH; SAPPHIRE;
D O I
10.1016/j.jcrysgro.2010.11.148
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
ZnO crystals doped with Cr, Mn, Fe and Co were grown by the flux method. The prepared crystals revealed no phase separation detectable by X-ray diffraction. Structure properties were characterized by Raman and photoluminescence spectroscopy. For ZnO:Co, Mn and Cr, no spontaneous ferromagnetic moment was observed up to T=2 K whereas for the ZnO:Fe crystals the m(H) curves suggest the existence of 5 nm superparamagnetic iron clusters. At low temperatures the m(H) curves can be interpreted as a superposition of major paramagnetic and minor antiferromagnetic contribution. The paramagnetic part corresponds to the presence of Co2+, Fe3+, Mn2+ ions and small Cr atom clusters. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:123 / 128
页数:6
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