Effect of La₂O₃, CoO, Cr₂O₃ and MoO₃ nucleating agents on crystallization behavior and magnetic properties of ferromagnetic glass-ceramic in the system Fe₂O₃路CaO路ZnO路SiO₂

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• 作者：Salwa A.M. Abdel-Hameed ; ^{Salwa_NRC@hotmail.com} ; Rawhia.L. Elwan
• 关键词：Magnetic materials ; Microstructure ; X-ray diffraction
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：May, 2012
• 卷：47
• 期：5
• 页码：1233-1238
• 文件大小：1004 K

摘要

Preparation and characterization of ferromagnetic glass ceramic in the system Fe₂O₃路CaO路ZnO路SiO₂ with different nucleating agents was studied. The effect of La₂O₃, CoO, Cr₂O₃ and MoO₃ as nucleating agents was investigated. Differential thermal analysis; X-ray diffraction and transmission electron microscope were used to investigate thermal behavior, sequence of crystallization and microstructure of the samples. XRD analysis for as prepared samples revealed the crystallization of single magnetite phase. Heat treatment at 900 掳C/2 h revealed the appearance of minor amounts of calcium silicate, hematite and cristobalite beside magnetite. TEM revealed crystallization of crystallite size in the range 50-100 nm. Lattice parameters, cell volume and crystallite size were stimulated from XRD data. Magnetic properties of quenched samples were measured under 20 kG.