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1998 International Conference on Microwave and Millimeter Wave Technology

作者： Zhiquan Han Southwest Institute of Applied Magnetics of China

ISBN: (纸本)0780343085

The spin wave manifold(spin wave eigcnfrequencies) for the grain-surface-layer is obtained from the procession equati(?),based on the assumption, that in the grain-surface-layer of the polycrystalline ferrite there exists an induced uniaxial anisotropy field H which is caused by the impurities depositing nearby the grain boundary and by the stresses due to lattice *** top and the bottom of the manifold at various applied magnetic fields are illustrated in comparing with the manifold for the inner grain *** is concluded that the off-resonance effective linewidth△H arises from the losses of the spin wave resonance excited on the gram-surface-layers and it is proportional to the volume fraction of grain-surface-layers and sensitive to the grain size and the porosity strongly.

关键词： ferrites ferromagnetic resonance spin waves magnetic anisotropy microwave loss polycrystalline ferrite off-resonance field spin wave manifold spin wave eigenfrequency grain surface layer procession equation uniaxial anisotropy field grain boundary impurity lattice mismatch stress magnetic field effective linewidth spin wave resonance grain size porosity

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Preparation and Structural Properties of ZnAl_xFe_2-xO₄ Spinel Oxide

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American Journal of Analytical Chemistry 2016年第2期7卷 203-209页

作者： Shahzad Hossain Goutam Dev Mst. Sanjida Aktar Muhammad Kamrul Hasan A. K. M. Zakaria Tapash Kumar Datta Imtiaz Kamal Sk. Md. Yunus Md. Habibul Ahsan Abul Kalam Azad Institute of Nuclear Science & Technology Bangladesh Atomic Energy Commission Dhaka Bangladesh Faculty of Integrated Technologies Universiti Brunei Darussalam Gadong Brunei Darussalam Department of Physics Shahjalal University of Science and Technology Sylhet Bangladesh

The ZnAlxFe2-xO4 (x = 0.0, 0.2 and 0.4) spinel ferrites were prepared by the conventional solid state reaction in air at 1350°C. The X-ray diffraction of all the three samples showed sharp Bragg peaks indicating the formation of a single phase spinel structure. The lattice parameters of the samples were determined from the X-ray diffraction data using the Nelson-Riley extrapolation method. The lattice parameters, cation distribution and oxygen position parameters have also been determined by refining the data by the Rietveld method. Rietveld refinement of the XRD data reveals all the samples to possess cubic symmetry corresponding to the space group Fd3m. Lattice parameters were found to decrease with increasing Al concentration, i.e. 8.4322, 8.4002, and 8.3984 Åfor x = 0.0, 0.2 and 0.4, respectively.

关键词： polycrystalline ferrite X-Ray Diffraction Spinel ferrite Rietveld Refinement Space Group Fd3m Lattice Parameter

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