NDLI: Transport and magnetic properties of encapsulated Ni-NiO/ZrO/sub 2/ nanostructures

Content Provider	IEEE Xplore Digital Library
Author	Nayak, B.B. Vitta, S. Nigam, A.K. Bahadur, D.
Copyright Year	2005
Description	Author affiliation: Dept. of Metallurgical Eng. & Mater. Sci., Indian Inst. of Technol., Mumbai, India (Nayak, B.B.; Vitta, S.)
Abstract	Nanoparticles of Ni encapsulated with either NiO or ZrO/sub 2/ are prepared by aqueous solution and their transport and magnetic properties are studied in detail. The encapsulated Ni particles are prepared by the simultaneous reduction of Ni-chloride and Zr-oxychloride using sodium borohydride as the reducing agent. The precursor solution has the following composition: 1M NiCl/sub 2/: x M ZrOCl/sub 2/ where x varies from 0 to 0.5 and M is the molar concentration. Results from X-ray diffraction pattern show that addition of ZrO/sub 2/ makes the Ni crystalline peaks strong and the amorphous NiO peak becomes weak indicating that ZrO/sub 2/ stabilizes Ni formation and also protects Ni from getting oxidized. XRD patterns and TEM reveal that Ni crystallites are /spl ap/ 20-40 nm in size. The electrical resistivity decreases first and then increases with the addition of ZrO/sub 2/. Also, addition of ZrO/sub 2/ promotes Ni formation by reducing the NiO shell initially leading to better interparticle connectivity while for x /spl ges/ 0.10 M the interparticle connectivity is reduced due to ZrO/sub 2/ encapsulation. Room temperature saturation magnetization increases with addition of ZrO/sub 2/ up to /spl ap/0.05 M and then decreases. The temperature dependent magnetization however shows a superparamagnetic behavior with the blocking temperature T/sub B/ being close to room temperature. The encapsulated Ni particles exhibit remanence and the coercivity field is found to be /spl ap/ 480 Oe.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	1037
Ending Page	1038
File Size	211002
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1463948
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic properties Temperature dependence Crystallization Nanoparticles X-ray diffraction Amorphous materials Protection X-ray scattering Electric resistance Encapsulation
Content Type	Text
Resource Type	Article

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