Synthesis and characterization of Ni_1−xZn_xFe₂O₄ spinel ferrites from tailored layered double hydroxide precursors

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• 作者：Feng Li ; Xiaofeng Liu ; Qiaozhen Yang ; Junjie Liu ; David G. Evans and Xue Duan
• 关键词：A. Layered compounds ; A. Magnetic materials ; B. Chemical synthesis ; C. X-ray diffraction ; C. Mö ; ssbauer spectroscopy
• 刊名：Materials Research Bulletin
• 出版年：2005
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：2005
• 卷：40
• 期：8
• 页码：1244-1255
• 文件大小：238 K

摘要

In this paper, a series of pure Ni_{1 − x}Zn_xFe₂O₄ (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)_{1 − x − y}Fe_y²⁺Fe_x³⁺(OH)₂]^x+(SO₄²⁻)_x/2·mH₂O at 900 °C for 2 h, in which the molar ratio of (Ni²⁺ + Zn²⁺)/(Fe²⁺ + Fe³⁺) 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 Mössbauer spectroscopy. The results indicate that calcination of the as-synthesized LDH precursor affords a pure single Ni_{1 − x}Zn_xFe₂O₄ (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.