Influence of rare earth Ce³⁺ on structural, electrical and magnetic properties of Sr²⁺ based W-type hexagonal ferrites

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• 作者：Imran Sadiq ; Imran Khan ; Faiza Aen ; M.U. Islam ; M.U. Rana ; ^{mazharrana@bzu.edu.pk}
• 关键词：Sol&ndash ; gel ; Hexaferrites ; XRD ; SEM ; Resistivity ; Magnetic properties
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 April, 2012
• 卷：407
• 期：8
• 页码：1256-1261
• 文件大小：717 K

摘要

A series of single phase W-type Sr_3鈭?em>xCe_xFe₁₆O₂₇ (x=0, 0.02, 0.04, 0.06, 0.08, 0.10) hexagonal ferrites prepared by the Sol-Gel method was sintered at 1050 掳C for 5 h. The X-ray diffraction analysis reveals that all the samples belong to the family of W-type hexagonal ferrites. The c/a ratio falls in the range of W-type hexagonal ferrites. The grain size was measured by SEM varies from 0.7684 to 0.4366 渭m which shows that the Ce³⁺ substituted samples have smaller grain size than pure ferrite Sr₃Fe₁₆O₂₇ which results from the difference in ionic radii of Ce³⁺ (1.034 脜) and Sr²⁺ (1.12 脜). The room temperature resistivity of the present samples varies from 6.5脳10⁸ to 272脳10⁸ 惟-cm. The coercivity increases from 1370 to 1993 Oe which is consistent with the decrease in grain size. The coercivity values indicate that the present samples fall in the range of hard ferrites. The large value of H_c may be due to domain wall pinning at the grain boundaries.