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Effect of thermal treatment on room-temperature ferromagnetism in Co-doped ZnO powders

โœ Scribed by Xueyun Zhou; Shihui Ge; Dongsheng Yao; Yalu Zuo; Yuhua Xiao

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
612 KB
Volume
403
Category
Article
ISSN
0921-4526

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โœฆ Synopsis

The Co-doped ZnO powders were synthesized by sol-gel method, and treated at different temperatures (673-873 K) in the presence or absence of NH 3 atmosphere for 0.5 and 2 h, respectively. X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) show that better crystal structure can cause larger ferromagnetism and the second phase (Co 3 O 4 ) is the reason for saturation magnetization decrease of the sample sintered at higher temperature in air. XPS and nuclear magnetic resonance (NMR) prove the existence of Co 2+ ions in the Zn 0.9 Co 0.1 O and the absence of Co clusters, indicating intrinsic ferromagnetism of the samples treated in air. However, strong ferromagnetism of the samples annealed in NH 3 is ascribed to cobalt nitride formed during annealing.

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