The effect of thulium ion substitution for iron on the structural and electromagnetic properties of Mg-Mn ferrites is reported. The Mg0.9Mn0.1TmxFe1.8-xO4 ferrite compositions with x=0.0, 0.025, 0.05, and 0.075 were synthesized by a nitrate-citrate solution combustion method. Tm substitution had taken place and this was found to produce a secondary phase TmFeO3. The crystallite size of the powder calcined at 500 degrees C was in the range of 9-13 nm. Subsequently, the calcined ferrite powders were compacted and sintered at 1250 degrees C. It was found that the physical and magnetic properties had changed with Tm contents. Bulk density was found to decrease from 4.26 to 3.82 g/cm(3) with increasing Tin contents. It was also found that the saturation magnetization (M-s=38.41-23.62 emu/g) had decreased with an increase of Tm. In this study, the highest resistivity (39.84 x 10(6) Omega cm) was observed for Mg0.9Mn0.1Fe1.725Tm0.075O4. The correlation between structural and electromagnetic properties of the Tm-substituted samples is interpreted based on phase composition as well as microstructure. (C) 2015 Elsevier B.V. All rights reserved
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机译：据报道th离子替代铁对Mg-Mn铁氧体结构和电磁性能的影响。通过硝酸柠檬酸盐溶液燃烧法合成了x = 0.0、0.025、0.05和0.075的Mg0.9Mn0.1TmxFe1.8-xO4铁氧体组合物。发生了Tm取代，发现产生了第二相TmFeO3。在500℃下煅烧的粉末的微晶尺寸在9-13nm的范围内。随后，将煅烧的铁氧体粉末压实并在1250℃下烧结。发现物理和磁性能随Tm含量而改变。随着锡含量的增加，堆密度从4.26降至3.82 g / cm（3）。还发现，饱和磁化强度（M-s = 38.41-23.62 emu / g）随着Tm的增加而降低。在这项研究中，Mg0.9Mn0.1Fe1.725Tm0.075O4的电阻率最高（39.84 x 10（6）Ω厘米）。 Tm取代样品的结构和电磁性能之间的相关性是根据相组成和微观结构来解释的。 （C）2015 Elsevier B.V.保留所有权利
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