ABSTRACT Nickel-cobalt ferrite (NCF) without Sn-dopant and with (x = 0 to 0.1%), (Ni0.7Co0.3)(Fe2–xSnx)O4+ d, have been synthesized through solid-state route. Calcination of oxides at 900°C yielded spinel phase as confirmed by X-ray diffraction. Sn doping does not show much variation in lattice constants, but slightly increases crystallite size. Green compacts have been well sintered in 1150°-1200°C for 10 h. Microstructure of fractured specimens obtained using field emission scanning electron microscope show well packed polygonal grains with 2-3 μm size range. Dielectric and magnetic behavior of pristine and Sn-doped NCF have been measured in 100 Hz to 1 MHz range using a precision LCR meter, Sn-doping up to x=0.1 improves the dielectric properties of NCF, but deteriorates the magnetic properties. GRAPHICAL ABSTRACT

中文翻译：

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Sn 对 Ni-Co 尖晶石铁氧体在 LF 和 MF 范围内的磁性和介电性能的影响

摘要 不含 Sn 掺杂剂和 (x = 0 至 0.1%)、(Ni0.7Co0.3)(Fe2–xSnx)O4+ d 的镍钴铁氧体 (NCF) 已通过固态途径合成。X 射线衍射证实，在 900°C 下煅烧氧化物产生尖晶石相。Sn 掺杂在晶格常数上没有表现出太大的变化，但会略微增加微晶尺寸。生坯已在 1150°-1200°C 下烧结 10 小时。使用场发射扫描电子显微镜获得的断裂试样的显微结构显示了具有 2-3 μm 尺寸范围的填充良好的多边形晶粒。使用精密 LCR 计在 100 Hz 至 1 MHz 范围内测量了原始和 Sn 掺杂 NCF 的介电和磁性能，Sn 掺杂至 x=0.1 可提高 NCF 的介电性能，但会降低磁性。图形概要