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Magnetic and Mössbauer investigations of soft Co 2 Z-type hexa nanoferrites
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.jallcom.2018.07.114
Anita Manhas , Khalid M. Batoo , M. Singh

Abstract Co2Z-type hexa nanoferrites of the series Ba3-XSrXCo2Fe24O41 (where x = 0, 0.5, 1.0, 1.5 and 2.0) are synthesized by sol-gel auto combustion method. The effects of Sr2+ substitution for Ba2+ and optimized synthesis conditions are reported using the structural, magnetic and Mossbauer study. The X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) along with the selected area electron diffraction (SAED) clearly indicate the formation of a single-phased Z-type hexagonal nanoferrites with P63/mmc space group. The hysteresis curves obtained by vibrating sample magnetometer (VSM) at room temperature displayed the typical characteristics of magnetically soft materials indicating the decrease in coercivity with the increase in Sr2+ concentration in synthesized hexa nanoferrites, which are validated by the room temperature Mossbauer spectra with least-squares fit sextets of six distinguishable sites (A: 4fIV, B: 4fIV*, C: 12kVI*, D: 4fVI* + 4eIV, E: 12kVI and F: 2dV + 2aVI + 4fVI + 4eVI). Selection of Sr2+ dopant and sol-gel auto combustion soft chemical route are the leading ways to control the coercivity of Co2Z-type hexa nanoferrites.

中文翻译:

软 Co 2 Z 型六纳米铁氧体的磁性和穆斯堡尔研究

摘要 通过溶胶-凝胶自燃法合成了 Ba3-XSrXCo2Fe24O41 系列(其中 x = 0、0.5、1.0、1.5 和 2.0)的 Co2Z 型六纳米铁氧体。使用结构、磁性和 Mossbauer 研究报告了 Sr2+ 替代 Ba2+ 和优化合成条件的影响。X 射线衍射 (XRD) 分析和透射电子显微镜 (TEM) 以及选区电子衍射 (SAED) 清楚地表明形成了具有 P63/mmc 空间群的单相 Z 型六方纳米铁氧体。在室温下通过振动样品磁强计 (VSM) 获得的磁滞曲线显示出软磁材料的典型特征,表明随着合成六纳米铁氧体中 Sr2+ 浓度的增加矫顽力降低,通过室温穆斯堡尔谱和六个可区分位点(A:4fIV、B:4fIV*、C:12kVI*、D:4fVI* + 4eIV、E:12kVI 和 F:2dV + 2aVI)的最小二乘拟合六重组进行验证+ 4fVI + 4eVI)。Sr2+掺杂剂的选择和溶胶-凝胶自燃软化学路线是控制Co2Z型六纳米铁氧体矫顽力的主要途径。
更新日期:2018-10-01
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