Structural, optical and magnetic properties of Cr-substituted CeO2 nanoparticles

被引：46

作者：

Alla, Santhosh Kumar ^{[1
]}

Komarala, Eswara Vara Prasadarao ^{[2
]}

Mandal, Rajiv Kumar ^{[1
]}

Prasad, Nand Kishore ^{[1
]}

机构：

[1] Indian Inst Technol BHU, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

[2] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Powai, India

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2016年 / 182卷

关键词：

Nanostructures; Oxides; Photoluminescence spectroscopy; Magnetic properties; ROOM-TEMPERATURE FERROMAGNETISM; ULTRAVIOLET-ABSORPTION SPECTRA; X-RAY PHOTOELECTRON; DEPENDENCE; SIZE; VACANCY; OXYGEN; AL2O3; XPS;

D O I：

10.1016/j.matchemphys.2016.07.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline CrxCe1-xO2 (0 <= x <= 0.3) samples were synthesized by a microwave refluxing method. These samples were characterized by X-ray diffractometer, Transmission electron microscope, Raman spectroscopy, UV-Vis spectrometer, Photoluminescence, and X-ray photoelectron spectroscopy. The XRD and TEM analyses indicates the formation of single phase in them. UV-vis spectroscopy results displayed blue shift of absorption peaks with increased Cr content. Magnetic measurements showed initial increase followed by decrease of saturation magnetization (M-s) with increasing doping concentration. The Ms value of x = 0.05 is nearly four times larger than that of undoped CeO2. This initial enhancement of Ms has been attributed to the creation of oxygen vacancies. The decrease in Ms at higher concentrations, has been corroborated with the appearance of antiferromagnetic interaction above a threshold value of Cr3+ content which is lying between x = 0.05 and 0.1. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：280 / 286

页数：7

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