A comparative study of the electrical and the magnetic properties and Mössbauer studies of normal and hot pressed MgxMn1−xFe2O4 ferrites
A comparative study of the electrical and the magnetic properties and Mössbauer studies of normal and hot pressed MgxMn1−xFe2O4 ferrites
复制标题
普通和热压 MgxMn1−xFe2O4 铁氧体的电性能和磁性能的比较研究以及穆斯堡尔研究
DOI：
10.1016/j.jmmm.2005.04.029
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发表时间：
2006
影响因子：
2.7
通讯作者：
Mahavir Singh
中科院分区：
文献类型：
--
作者：
Mahavir Singh
通过用合适的掺杂剂取代基组分的比例和改善制备条件，有望改变铁氧体的性能。本研究采用常规陶瓷工艺和热压陶瓷工艺制备了镁铁氧体系列铁氧体。镁锰铁氧体的热压可同时控制晶粒长大和气孔率，从而改善其磁性能和显微组织性能。然而，镁锰铁氧体的热压会导致其直流电阻率的恶化。用X射线分析和磁化方法研究了阳离子的分布。根据阳离子分布和Neel的两个亚晶格模型，可以解释饱和磁化强度和居里温度随镁离子浓度的变化。观测到的Moessbauer谱显示了两个超精细分裂六重态，没有磁弛豫，表明没有磁化壁振荡。通过考虑主要的超转移超精细相互作用(STHI)，定性地解释了内部磁场的变化。
Modifying the proportion of the base composition by substituting with suitable dopants and improving the preparation conditions is expected to change the performance of ferrites. In the present study, Mg {sub x} Mn{sub 1-} {sub x} Fe{sub 2}O{sub 4} series of ferrites were prepared by, the conventional ceramic technique and the hot-pressed ceramic technique. Hot pressing of Mg-Mn ferrites results in an improvement of their magnetic and micro-structural properties as it controls simultaneously grain growth and porosity. Hot pressing of the Mg-Mn ferrites, however, results in a deterioration of their DC resistivity. The cation distribution has been studied by X-ray analysis and magnetisation. The variation of the saturation magnetisation and Curie temperature with increasing concentration of the Mg{sup 2+} ions can be explained on the basis of cation distribution and Neel's two sub-lattice models. The observed Moessbauer spectra show two hyperfine split sextets with an absence of magnetic relaxation indicating an absence of domain wall oscillations. The variations of the internal magnetic field have been qualitatively explained by taking into account, the predominant super-transferred hyperfine interactions (STHI)