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首页> 外文期刊>CERAMICS INTERNATIONAL >Self-ignited synthesis of Mg-Gd-Mn nanoferrites and impact of cation distribution on the dielectric properties
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Self-ignited synthesis of Mg-Gd-Mn nanoferrites and impact of cation distribution on the dielectric properties

机译：Mg-Gd-Mn纳米铁氧体的自燃合成及阳离子分布对介电性能的影响

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摘要

Mg_(0.9)Mn_(0.1)Gd_xFe_(2-x)O_4 nanoferrites were processed for the first time by a solution combustion technique. X-ray diffraction studies revealed the spinel cubic structure of the synthesized ferrites. The particle size was observed to increase (13-16 nm) with an increase in Gd~(3+) ion content. The cation distribution is inferred from the X-ray diffraction. It is observed from cation distribution that Gd~(3+) ions preferred octahedral (B) sites. The DC resistivity was found to be increasing with an increase in Gd~(3+) content. The dielectric constant e' and loss tangent (tan δ) was observed to decrease with the addition of Gd~(3+) content as well as with the increase in frequency. The variations in DC resistivity as well as dielectric constant with the increasing substitution of Gd~(3+) ions have been correlated to the cation distribution. The very high values of DC resistivity (~10~8 Ω. cm) and low values of loss tangent (0.9-0.008) are the prime achievements of this work.
机译：Mg_（0.9）Mn_（0.1）Gd_xFe_（2-x）O_4纳米铁氧体首次通过固溶燃烧技术处理。 X射线衍射研究揭示了合成铁氧体的尖晶石立方结构。随着Gd〜（3+）离子含量的增加，粒径增加（13-16 nm）。从X射线衍射推断出阳离子分布。从阳离子分布可以看出，Gd〜（3+）离子优先选择八面体（B）位。发现DC电阻率随着Gd〜（3+）含量的增加而增加。观察到介电常数e'和损耗角正切（tanδ）随着Gd〜（3+）含量的增加以及频率的增加而降低。随着Gd〜（3+）离子取代度的增加，直流电阻率和介电常数的变化与阳离子分布有关。直流电阻率的极高值（〜10〜8Ω。cm）和损耗角正切值极低（0.9-0.008）是这项工作的主要成就。

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