Variation in the structural and magnetic properties of heterovalent Mn²⁺-Si⁴⁺ substituted MnCrFeO nanoparticles

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• 作者：R.H. Kadam ; Kirti Desai ; Supriya R. Kadam ; Sagar E. Shirsath
• 关键词：Sol&ndash ; gel chemistry ; Cation distribution ; Electron microscopy ; Crystal structure ; Magnetic properties
• 刊名：Solid State Sciences
• 出版年：December, 2013
• 年：2013
• 卷：26
• 期：Complete
• 页码：31-37
• 全文大小：1079 K

文摘

We have synthesized heterovalent Mn²⁺-Si⁴⁺ substituted MnCrFeO nanoparticles with a nominal composition Mn_1+<em>xem>Si_<em>xem>CrFe_{1鈭?<em>xem>}O₄ (<em>xem>聽=聽0.0-0.3) via sol-gel auto-combustion method. X-ray diffractometer, transmission electron microscopy, magnetization measurements were used to study the effects of Mn²⁺-Si⁴⁺ heterovalent ions on the structural and magnetic properties of MnCrFeO. As a result, it was found that the Mn²⁺-Si⁴⁺ ions affect the crystalline structures and magnetic properties of MnCrFeO. X-ray diffraction pattern showed that the samples have the single phase cubic spinel structure of which the lattice constant slightly increased upon Mn²⁺-Si⁴⁺ substitution. The mean crystallite size of the samples was in the range of 21-27聽nm as deduced from the XRD line broadening. Cation distribution was estimated using XRD data and it shows that Mn²⁺ and Si⁴⁺ ions prefer tetrahedral A-site. Magnetic measurement shows that saturation magnetization and magneton number decreased with Mn²⁺-Si⁴⁺ substitution with the formation of a collinear spin arrangement.