Magnetic properties and structural analysis on spinel MnFe2O4 nanoparticles prepared via non-aqueous microwave synthesis,Zeitschrift für anorganische und allgemeine Chemie

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Magnetic properties and structural analysis on spinel MnFe2O4 nanoparticles prepared via non-aqueous microwave synthesis
Zeitschrift für anorganische und allgemeine Chemie ( IF 1.1 ) Pub Date : 2021-09-03 , DOI: 10.1002/zaac.202100190
Christopher Simon ₁ , André Blösser ₁ , Mirco Eckardt ₁ , Hannah Kurz ₁ , Birgit Weber ₁ , Mirijam Zobel ₁ , Roland Marschall ₂

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Phase-pure 6 nm spinel MnFe₂O₄ nanoparticles with high specific surface area of 145 m² g⁻¹ were successfully prepared via microwave-assisted non-aqueous sol-gel synthesis. The phase evolution during postsynthetic thermal treatment was investigated systematically by various methods, including powder X-ray diffraction (PXRD), pair distribution function (PDF) analysis, and Raman spectroscopy. Our results show that the material decomposes to non-spinel binary compounds α-Mn₂O₃ and α-Fe₂O₃ at temperatures between 400 and 600 °C. The application potential of MnFe₂O₄ nanoparticles with 3d⁵ Mn(II) and Fe(III) ions with respect to the magnetic properties was demonstrated by superconducting quantum interference device (SQUID) magnetometry, with the as-synthesized nanoparticles reaching a high saturation magnetization of 2.62 μ_B per formula unit (63.5 Am² kg⁻¹) at 10 K. We further highlight the visible-light response of synthesized powders, making the materials promising for light-related applications, e. g. photocatalytic hydrogen evolution. An important additional feature of MnFe₂O₄ nanoparticles is their good dispersibilty in polar or non-polar media, as a result of postsynthetic colloidal stabilization with betaine hydrochloride, oleic acid combined with oleylamine, or citric acid.

中文翻译：

非水微波合成法制备尖晶石MnFe2O4纳米颗粒的磁性能及结构分析

通过微波辅助非水溶胶-凝胶合成，成功制备了具有145 m ² g ^-1高比表面积的相纯6 nm 尖晶石MnFe ₂ O ₄纳米粒子。通过各种方法系统地研究了合成后热处理过程中的相演变，包括粉末 X 射线衍射 (PXRD)、对分布函数 (PDF) 分析和拉曼光谱。我们的结果表明，该材料分解为非尖晶石二元化合物α -Mn ₂ O ₃和α -Fe ₂ O ₃在 400 至 600 °C 的温度下。具有 3d ⁵ Mn(II) 和 Fe(III) 离子的 MnFe ₂ O ₄纳米粒子在磁性方面的应用潜力通过超导量子干涉仪 (SQUID) 磁力测定法证明，合成的纳米粒子达到高饱和在 10 K 时每个配方单位的磁化强度为 2.62 μ _B（63.5 Am ² kg ^-1）。我们进一步强调了合成粉末的可见光响应，使该材料有望用于光相关应用，例如。克。光催化析氢。MnFe ₂ O _{4 的}一个重要附加特性由于甜菜碱盐酸盐、油酸与油胺或柠檬酸的合成后胶体稳定化，纳米颗粒在极性或非极性介质中具有良好的分散性。

更新日期：2021-11-12

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