Synthesis and characterization of Ni{sub 1-x}Zn {sub x}Fe{sub 2}O{sub 4} spinel ferrites from tailored layered double hydroxide precursors
- Education Ministry Key Laboratory of Science and Technology of Controllable Chemical Reactions, University of Chemical Technology, P.O. Box 98, Beijing 100029 (China)
In this paper, a series of pure Ni{sub 1-x}Zn {sub x}Fe{sub 2}O{sub 4} (0 {<=} x {<=} 1) spinel ferrites have been synthesized successfully using a novel route through calcination of tailored hydrotalcite-like layered double hydroxide molecular precursors of the type [(Ni + Zn){sub 1-x-y}Fe {sub y} {sup 2+}Fe {sub x} {sup 3+}(OH){sub 2}] {sup x+}(SO{sub 4} {sup 2-}) {sub x/2}.mH{sub 2}O at 900 deg. C for 2 h, in which the molar ratio of (Ni{sup 2+} + Zn{sup 2+})/(Fe{sup 2+} + Fe{sup 3+}) was adjusted to the same value as that in single spinel ferrite itself. The physico-chemical characteristics of the LDHs and their resulting calcined products were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and Moessbauer spectroscopy. The results indicate that calcination of the as-synthesized LDH precursor affords a pure single Ni{sub 1-x}Zn {sub x}Fe{sub 2}O{sub 4} (0 {<=} x {<=} 1) spinel ferrite phase. Moreover, formation of pure ferrites starting from LDHs precursors requires a much lower temperature and shorter time, leading to a lower chance of side-reactions occurring, because all metal cations on the brucite-like layers of LDHs can be uniformly distributed at an atomic level.
- OSTI ID:
- 20891564
- Journal Information:
- Materials Research Bulletin, Vol. 40, Issue 8; Other Information: DOI: 10.1016/j.materresbull.2005.04.011; PII: S0025-5408(05)00133-9; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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