On the structural analysis and magnetic behavior of heavily doped Zn_{1鈭?span style='font-style: italic'>x}Mn_xO nanopowders synthesized by wet chemistry method

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• 作者：J. Mera^a ; C. C&#243 ; rdoba^a ; C. Paucar^b ; A. G&#243 ; mez^c ; D. Fuchs^d ; O. Morá ; n^b ; ^{omoranc@unal.edu.co}
• 关键词：Diluted magnetic semiconductors ; Pechini's method ; X-ray diffraction ; Raman spectroscopy ; Magnetization measurements
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：May, 2012
• 卷：324
• 期：10
• 页码：1758-1763
• 文件大小：405 K

摘要

Nanocrystalline Zn_1鈭?em>xMn_xO(x=0鈭?.1) powders are prepared by polymeric precursor method and their structural and magnetic properties carefully studied. X-ray diffraction studies and Raman spectroscopy reveal that Mn²⁺ ions have substituted the Zn²⁺ ion without changing the w眉rtzite structure of pristine ZnO up to Mn concentrations x鈮?.05. The presence of a secondary phase, related to the solubility of Mn in ZnO is evident for higher Mn-doping concentrations. The negative value obtained for the Curie-Weiss temperature indicates that the interactions between the Mn ions are predominantly antiferromagnetic. Thus, no bulk ferromagnetism is evident in any of the studied samples.