The effect of additional doping with Nb, Al or Cu on ferromagnetism and conductivity in V-doped TiO2 powders

被引：9
作者：
Zhao, Q. [1 ,2 ]
Wu, P. [1 ]
Li, B. L. [1 ]
Jiang, E. Y. [1 ]
机构：
[1] Tianjin Univ, Dept Appl Sci, Inst Adv Mat Phys, Sch Sci,Tianjin Key Lab Low Dimens Mat Phys & Pre, Tianjin 300072, Peoples R China
[2] Inner Mongolia Univ Sci & Technol, Dept Appl Sci, Sch Math Phys & Biol Engn, Inner Mongolia Key Lab Utilizat Bayan Obo Multime, Baotou 014010, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2012年 / 407卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Dilute magnetic semiconductor; V-doped TiO2 powders; Additional doping; Ferromagnetism and conductivity; ROOM-TEMPERATURE FERROMAGNETISM; ELECTRONIC-STRUCTURE; MAGNETISM; NI; CR;
D O I：
10.1016/j.physb.2011.10.020
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Rutile Ti0.94V0.06O2 and Ti0.93V0.06M0.01O2 (M=Nb, Al, and Cu) polycrystalline powders are synthesized by the standard solid-state reaction method. The room-temperature saturation magnetization and resistivity of Ti0.94V0.06O2 powders are 2.5 x 10(-3) emu/g (approximate to 0.60 x 10(-3)mu(B)/V) and above 10(7) Omega cm, respectively. The ferromagnetism weakens remarkably, and the conductivity enhances after additional doping with Nb or Al in V-doped rutile TiO2 powders. The room-temperature magnetization and resistivity of Ti0.93V0.06Cu0.01O2 powders are 2.1 x 10(-3) emu/g and 1.26 x 10(6) Omega cm, respectively. Based on analysis for chemical valence of dopants by the x-ray photoelectron spectroscopy spectra, and using the bound magnetic polaron model, the microscopic mechanisms of ferromagnetism in V-doped rutile TiO2 powders with or without additional dopants are discussed in detail. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：171 / 174
页数：4
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