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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >A study of Ca-doped hexaferrite Sr1-xCaxFe12O19(x=0.0, 0.05, 0.1, 0.15, and 0.2) synthesized by sol-gel combustion method
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A study of Ca-doped hexaferrite Sr1-xCaxFe12O19(x=0.0, 0.05, 0.1, 0.15, and 0.2) synthesized by sol-gel combustion method

机译：通过溶胶 - 凝胶燃烧法合成了通过溶胶 - 凝胶燃烧方法（x = 0.05,0.1,0.15和0.1）的Ca掺杂的六氧化物Sr1-XcaxFe12O19（x = 0.05,0.1,0.15和0.2）

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Ca-doped Hexaferrites of composition Sr1-xCaxFe12O19(x = 0.0, 0.05, 0.1, 0.15, and 0.2) were synthesized by the sol-gel combustion method and sintered at the two temperatures of 900 and 1100 degrees C. X-ray powder diffraction (XRPD) measurements with Rietveld refinement analysis confirmed the formation of pure M-type hexaferrite phase for all samples, except for the x = 0.1 and 0.15 samples, sintered at 1100 degrees C, which also contained 2% and 0.7% hematite phase. The images obtained from field emission scanning electron microscope indicated all the prepared hexaferrite samples were composed of agglomerated nanoparticles and plate shape morphology for samples sintered at 1100 degrees C. FT-IR measurements also confirmed the formation of the hexaferrite structure. Hysteresis loops (M-H) of the samples were measured by a vibration sample magnetometer at room temperature, and the results obtained revealed decreasing saturation magnetization with increasing Ca content. Coercivity for the samples sintered at 900 degrees C was increased with increasing Ca content, while for the samples sintered at 1100 degrees C, it decreased due to the particle size effect. The optical band gaps of the prepared samples were in a range suitable for photovoltaic application. Dielectric constant (e) and dielectric loss (tan delta) were measured for all samples, and the values foreand tan delta for the samples sintered at 900 degrees C were less than those for the samples sintered at 1100 degrees C.
机译：通过溶胶-凝胶燃烧法合成了成分为Sr1-xCaxFe12O19（x=0.0、0.05、0.1、0.15和0.2）的掺钙六铁氧体，并在900和1100℃的两个温度下烧结。通过Rietveld细化分析的x射线粉末衍射（XRPD）测量证实了除x=0.1和0.15样品外，所有样品均形成纯M型六铁氧体相，在1100℃下烧结，其中还含有2%和0.7%的赤铁矿相。从场发射扫描电子显微镜获得的图像表明，所有制备的六铁氧体样品均由团聚的纳米颗粒组成，并且在1100℃烧结的样品具有板状形貌。FT-IR测量也证实了六铁氧体结构的形成。用振动样品磁强计在室温下测量了样品的磁滞回线（M-H），结果表明，随着Ca含量的增加，样品的饱和磁化强度降低。900℃烧结样品的矫顽力随Ca含量的增加而增加，而1100℃烧结样品的矫顽力则因粒度效应而降低。制备的样品的光学带隙在适合光伏应用的范围内。测量了所有样品的介电常数（e）和介电损耗（tanδ），并且在900℃下烧结的样品的介电常数（e）和介电损耗（tanδ）的值小于在1100℃下烧结的样品的介电常数（e）和介电损耗（tanδ）。

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