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Journal of Materials Chemistry Vol - 6 Issue - 5

Journal of Materials Chemistry Vol - 6 Issue - 4

Journal of Materials Chemistry Vol - 6 Issue - 3

Journal of Materials Chemistry Vol - 6 Issue - 2

Journal of Materials Chemistry Vol -5

Journal of Materials Chemistry Vol -4

Journal of Materials Chemistry Vol -3

Generation of magnetic metal particles in zeolite by borohydride reduction at ambient temperature

Content Provider	Royal Society of Chemistry (RSC)
Author	Manthiram, Arumugam Zhang, Lan
Copyright Year	1996
Abstract	Amorphous metallic particles containing some boron have been generated in a mordenite matrix by reducing the ion-exchanged M2+-mordenite (M = Fe, Co or Ni) at ambient temperature with sodium borohydride. The products have been characterized by X-ray powder diffraction, chemical analysis, transmission electron microscopy and SQUID magnetometer measurements. The Ni–B particles have a smaller particle size (20–40 nm) compared to the Co–B (70–120 nm) and Fe–B particles (140–200 nm). The Ni–B particles are deposited in defect pores within the mordenite framework while the Co–B and Fe–B particles are deposited on the external surfaces. The differences seem to arise owing to an easier reducibility of Ni2+ compared to Co2+ or Fe2+, and a reduction of Ni2+ in solid but Co2+ and Fe2+ in solution. All three systems exhibit superparamagnetic behaviour with the blocking temperature increasing from the Ni system to the Fe system. The differences in magnetic properties among the three systems are explained on the basis of the changes in magnetic anisotropic energy. The decreasing reducibility from Ni2+ to Fe2+ as well as the deposition of Co and Fe on the external surfaces seem to increase the compositional inhomogeneities and hence the magnetic anisotropic energy from the Ni system to the Fe system.
Starting Page	999
Ending Page	1004
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	6
Issue Number	6
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9960600999
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Boron Mordenite Composite material Sodium borohydride Powder diffraction Transmission electron microscopy SQUID Magnetometer Superparamagnetism Anisotropy
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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