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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Structural, thermoelectric power and magnetization measurements of Nd-doped Li-Ti ferrite by combustion synthesis
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Structural, thermoelectric power and magnetization measurements of Nd-doped Li-Ti ferrite by combustion synthesis

机译：燃烧合成法测量掺钕铁氧体的结构，热电功率和磁化强度

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摘要

Nd-doped Li-Ti ferrites with compositional formula Li0.4Ti0.1Fe2.5-xNdxO4 (where x = 0.0, 0.025, 0.05, 0.075 and 0.10) are prepared at 450 degrees C by combustion synthesis. X-ray analysis showed the limit of Nd-concentration for formation of single phase cubic is 0.075 and thereafter a secondary phase of FeNdO3 is observed. As the Nd-concentration increased to 0.075 the lattice parameter increased, which is attributed to the incorporation of larger ionic radius of Nd3+ ions in place of smaller ionic radius of Fe3+ in the spinel lattice. When Nd-concentration is 0.10, some of the Nd3+ ions diffuse to the grain boundaries, which can be correlated from scanning electron microscope analysis. The infrared spectra have shown three strong absorption bands in the range 400-600 cm(-1) and confirming the occupancies of Nd3+ into the spinel lattice. We explained for n-type semiconductors the Seebeck coefficient should be negative only. Saturation magnetization (M-S) value increases with increase in Nd-concentration indicating that Nd3+ ions are replacing the Fe3+ ions in the spinel lattice.
机译：通过燃烧合成在450℃下制备组成式为Li0.4Ti0.1Fe2.5-xNdxO4（其中x ＝ 0.0、0.025、0.05、0.075和0.10）的Nd掺杂的Li-Ti铁氧体。 X射线分析表明，形成单相立方晶的Nd浓度极限为0.075，此后观察到FeNdO3的第二相。当Nd浓度增加到0.075时，晶格参数增加，这归因于在尖晶石晶格中掺入了更大的Nd3 +离子半径，而不是较小的Fe3 +离子半径。当Nd浓度为0.10时，一些Nd3 +离子扩散到晶界，这可以通过扫描电子显微镜分析来确定。红外光谱显示了在400-600 cm（-1）范围内的三个强吸收带，证实了Nd3 +在尖晶石晶格中的占有率。我们解释了对于n型半导体，塞贝克系数应仅为负。饱和磁化强度（M-S）值随着Nd浓度的增加而增加，这表明Nd3 +离子取代了尖晶石晶格中的Fe3 +离子。

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