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<p>A low-cost and efficient method should be developed to synthesize the stable nickel ferrites NiFe<sub>2</sub>O<sub>4</sub> with the inverse spinel crystal structure, which is beneficial for improving product performance and broadening product application prospects. In the primary oxidation roasting process, nickel ferrite NiFe<sub>2</sub>O<sub>4</sub> with a magnetization saturation (<i>M</i><sub>s</sub>) of 31.96 emu g<sup>–1</sup> and a coercive force (<i>H</i><sub>c</sub>) of 91.96 Oe was synthesized in an air atmosphere. In the secondary oxidation roasting technology, the synthesized NiFe<sub>2</sub>O<sub>4</sub> with a <i>M</i><sub>s</sub> of 40.93 emu g<sup>–1</sup> and a <i>H</i><sub>c</sub> of 149.4 Oe had a BET surface area of 10.58 m<sup>2</sup> g<sup>–1</sup>. The formation mechanism of nickel ferrites could be categorized in the synthesis process of NiFe<sub>2</sub>O<sub>4</sub>. The nickel ferrite NiFe<sub>2</sub>O<sub>4</sub> was classified as an inverse spinel crustal structure. The secondary oxidation roasting process could facilitate the transformation from disordered to ordered structure and normal spinel to inverse spinel in the crystal structure of nickel ferrite NiFe<sub>2</sub>O<sub>4</sub>.</p>

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An effective strategy for synthesis and magnetism property of nickel ferrite NiFe2O4 catalyst by a novel two-step oxidation roasting technology

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • Ruiyang Li,
  • Wei Tang,
  • Chenghong Liu,
  • Zhijun He,
  • Lihua Gao

摘要

A low-cost and efficient method should be developed to synthesize the stable nickel ferrites NiFe2O4 with the inverse spinel crystal structure, which is beneficial for improving product performance and broadening product application prospects. In the primary oxidation roasting process, nickel ferrite NiFe2O4 with a magnetization saturation (Ms) of 31.96 emu g–1 and a coercive force (Hc) of 91.96 Oe was synthesized in an air atmosphere. In the secondary oxidation roasting technology, the synthesized NiFe2O4 with a Ms of 40.93 emu g–1 and a Hc of 149.4 Oe had a BET surface area of 10.58 m2 g–1. The formation mechanism of nickel ferrites could be categorized in the synthesis process of NiFe2O4. The nickel ferrite NiFe2O4 was classified as an inverse spinel crustal structure. The secondary oxidation roasting process could facilitate the transformation from disordered to ordered structure and normal spinel to inverse spinel in the crystal structure of nickel ferrite NiFe2O4.