缺陷诱导的Cr掺杂TiO2纳米粉末的铁磁性

doi:10.3724/SP.J.1077.2013.12773

无机材料学报 ›› 2013, Vol. 28 ›› Issue (10): 1098-1102.DOI: 10.3724/SP.J.1077.2013.12773 CSTR: 32189.14.SP.J.1077.2013.12773

缺陷诱导的Cr掺杂TiO₂纳米粉末的铁磁性

赵倩^{1, 2}, 吴萍²

(1. 内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室, 省部共建国家重点实验室培养基地, 数理与生物工程学院应用物理系, 包头 014010; 2. 天津大学理学院, 现代材料物理研究所应用物理系, 天津市低维功能材料物理与制备技术重点实验室, 天津 300072)

收稿日期:2012-12-24 修回日期:2013-03-03 出版日期:2013-10-20 网络出版日期:2013-09-18
基金资助:
国家自然科学基金(51074112); 天津市自然科学基金重点项目(11JCZDJC22100); 内蒙古自治区科技厅项目(01311005); 内蒙古科技大学创新基金(2011NCL003)

Ferromagnetism Induced by Defects in Cr-doped TiO₂ Nanopowders

ZHAO Qian^{1, 2}, WU Ping²

(1. Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources: Elected State Key Laboratory, Department of Applied Physics, School of Mathematics, Physics and Biological Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2. Department of Applied Physics, Institute of Advanced Materials Physics, School of Science, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Tianjin University, Tianjin 300072, China)

Received:2012-12-24 Revised:2013-03-03 Published:2013-10-20 Online:2013-09-18
Supported by:
National Natural Science Fundation(51074112); Tianjin Natural Science Foundation(11JCZDJC22100); Science and Technology Department of Inner Mongolia Autonomous Region (01311005); Innovation Fundation Supported by Inner Mongolia University of Science and Technology(2011NCL003)

摘要/Abstract

摘要： 用溶胶-凝胶法制备了金红石 Ti_1-xCr_xO₂ (x=0、0.04、0.08) 纳米粉末。磁性测量结果显示, 制备的 Cr 掺杂金红石 TiO₂ 纳米粉末具有室温铁磁性, 样品 x=0.04 和0.08 的饱和磁化强度M_s分别为 0.55×10^-3和 1.6×10^-3 emu/g, (emu/g=4π×10^-7Wb•m/kg)矫顽力H_c分别为 220和 40 Oe(Oe=10³/(4π)A/m)。Cr 掺杂量较大的样品的饱和磁化强度较大, 在 Ar 气中退火可以使粉末呈超顺磁性。Cr2p 区域的密集扫描 X 射线光电子能谱 (XPS)分析显示, 在所有的样品中 Cr都是以Cr³⁺存在。电子顺磁共振谱 (EPR)分析表明, 样品中的 Cr³⁺ 离子仅对其顺磁性有贡献。这些结果提示, 粉末微弱的室温铁磁性来源于掺杂引入的结构缺陷, 其中, 氧空位起重要作用。

关键词: Cr 掺杂 TiO₂ 纳米粉末, 室温铁磁性, 结构缺陷, 氧空位

Abstract: Rutile Ti_1-xCr_xO₂ (x=0, 0.04, 0.08) nanopowders were synthesized by the Sol-Gel method. Magnetic measurements indicate that as-prepared Cr-doped rutile TiO₂ nanopowders exhibit room-temperature ferromagnetism with saturation magnetizations Ms of 0.55×10^-3 and 1.6×10^-3 emu/g, respectively, for samples x=0.04 and 0.08. And their coercive forces H_care 220 and 40 Oe, respectively. The saturation magnetizations Ms increase with increasing Cr doping concentration. Annealed nanopowders in Ar atmosphere are superparamagnetic. The tight scan Cr2p by X-ray photoelectron spectroscopy spectra (XPS) indicates that Cr ions are in the +3 state for all samples. Electron paramagnetic resonance (EPR) spectra indicates that Cr³⁺ ions contribute only to paramagnetism. Based on above analysis, slight ferromagnetism of Cr-doped TiO₂nanopowders at room temperature originates from structural defects introduced by doping Cr ions, where oxygen vacancies play an important role.

Key words: Cr-doped TiO₂ nanopowders, room temperature ferromagnetism, structural defects, oxygen vacancies

中图分类号:

O474
O441

赵倩, 吴萍. 缺陷诱导的Cr掺杂TiO₂纳米粉末的铁磁性[J]. 无机材料学报, 2013, 28(10): 1098-1102.

ZHAO Qian, WU Ping. Ferromagnetism Induced by Defects in Cr-doped TiO₂ Nanopowders[J]. Journal of Inorganic Materials, 2013, 28(10): 1098-1102.

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缺陷诱导的Cr掺杂TiO₂纳米粉末的铁磁性

Ferromagnetism Induced by Defects in Cr-doped TiO₂ Nanopowders

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