Nanosize ferrites obtained by ball milling: Crystal structure, cation distribution, size-strain analysis and Raman investigations

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• 作者：Zeljka Cvejic ; Srdjan Rakic ; Aleksandar Kremenovic ; Bratislav Antic ; Cedomir Jovalekic and Philippe Colomban
• 关键词：Spinel ferrites ; Mechanochemical treatment ; Rietveld's analysis ; Raman spectra
• 刊名：Solid State Sciences
• 出版年：2006
• 出版时间：August 2006
• 年：2006
• 卷：8
• 期：8
• 页码：908-915
• 全文大小：299 K

文摘

Spinels samples Fe_2.85Y_0.15O₄ (S1) and Fe_2.55In_0.45O₄ (S2), such as Fe₃O₄+γ-Fe₂O₃ (S3) were obtained by ball milling. TEM micrograph as well as XRPD line broadening analyses show nanosize nature of the ferrite powders. Cation distribution, found by Rietveld refinement of the site occupancies, indicate Y³⁺ ions presence at 16d sites in Fe_2.85Y_0.15O₄, and a random In³⁺ ions distribution on both 8a and 16d sites in Fe_2.55In_0.45O₄ (space group Fd). From the XRPD line broadening analysis crystallite size and strain values were determined. The crystallite size and strain anisotropy is significant, especially for Fe_2.85Y_0.15O₄ and Fe_2.55In_0.45O₄. This result is discussed regarding the influence of the cation substitutions. The Raman signature confirms the spinel structure and the homogeneity of the particles.