Structural and electromagnetic studies of Ni_0.7Zn_0.3Ho_2xFe_2−2xO₄ ferrites

详细信息    查看全文

• 作者：Abdul Ghafoor^a ; Muhammad Azhar Khan^b ; ^{azhar.khan@iub.edu.pk" class="auth_mail" title="E-mail the corresponding author} ; M.U. Islam^a ; Zaheer Abbas Gilani^b ; ^c ; Alina Manzoor^b ; ^d ; ^{alinamanzoor@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Hasan M. Khan^a ; Irshad Ali^a ; Muhammad Farooq Warsi^e
• 关键词：Ni-Zn ferrites ; Conventional ceramic method ; XRD ; DC electrical resistivity ; Magnetic properties
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：42
• 期：12
• 页码：14252-14256
• 全文大小：940 K

文摘

A series of holmium (Ho) doped nanocrystalline Ni_0.7Zn_0.3Ho_2xFe_2–2xO₄; 0.0≤x≤0.07 ferrite was synthesized using the conventional ceramic technique. The cubic spinel structure was confirmed by powder X-ray diffraction (XRD). The lattice parameter increases with increase in Ho content due to large ionic radius of Ho³⁺ (0.901 Å) as compared to Fe³⁺ (0.67 Å). Room temperature DC electrical resistivity and activation energy both increase with the increase of holmium contents. The saturation magnetization (M_s) decreased gradually from 78.92 to 54.17 emu/g due to holmium ions substitution in Ni-Zn ferrites. This decrease in M_s is explained on the basis of redistribution of cations amongst the sites and weakening the A-B exchange interactions. An increase in electrical resistivity made this material suitable for its use in high frequency device applications.