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首页> 外文期刊>Physica, B. Condensed Matter >Influence of structure on infrared emissivity of lanthanum manganites
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Influence of structure on infrared emissivity of lanthanum manganites

机译：结构对镧锰氧化物红外发射率的影响

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摘要

The lanthanum manganites La1-xSrMnO3 (0.1 <= x <= 0.3) were prepared by standard solid-state reaction and sol-gel method, respectively. The structure, magnetization curves, infrared absorption and infrared normal emissivity (EN) in the 3-5 and 8-14 mu m wavebands of the samples were systematically investigated. The samples prepared by solid-state reaction are rhombohedral, and the samples obtained by sol-gel method are orthorhombic with irregularities in size and shape. The slight shoulder appearing on the peak of orthorhombic sample may be due to the asymmetric vibration in distorted lattice, and no infrared absorption occurs in the 3-5 and 8-14 mu m wavebands. The epsilon(N) of both samples decreases with increasing doping level, and due to stronger metallic character suggested by magnetization results, rhombohedral samples exhibit lower epsilon(N) values than orthorhombic ones. The epsilon(N) values in the 8-14 mu m waveband are higher than those in the 3-5 mu m waveband, and the epsilon(N) of rhombohedral sample changes significantly in the temperature range 293-328 K. For orthorhombic sample, the epsilon(N) increases slightly in the whole temperature range due to the weakening of the double-exchange interaction between Mn3+ and Mn4+.
机译：通过标准的固态反应和溶胶-凝胶法分别制备了镧锰La1-xSrMnO3（0.1 <= x <= 0.3）。系统地研究了样品在3-5和8-14μm波段的结构，磁化曲线，红外吸收率和红外法向发射率（EN）。固相反应制备的样品为菱面体，溶胶-凝胶法制备的样品为正交晶，尺寸和形状不规则。在正交晶样品的峰上出现轻微的肩峰可能是由于扭曲晶格中的不对称振动，并且在3-5和8-14μm波段没有红外吸收发生。两种样品的ε（N）随掺杂水平的提高而降低，并且由于磁化结果表明具有更强的金属特性，菱形体样品的ε（N）值比正交晶的样品低。 8-14微米波段的ε（N）值比3-5微米波段的ε值高，菱形体样品的ε（N）在293-328 K的温度范围内变化很大。 ，由于Mn3 +和Mn4 +之间的双向交换作用减弱，ε（N）在整个温度范围内略有增加。

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