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首页> 外文期刊>Journal of Applied Physics >Thermoelectric and magnetic properties of nanocrystalline La_(0.7)Sr_(0.3)CoO_3
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Thermoelectric and magnetic properties of nanocrystalline La_(0.7)Sr_(0.3)CoO_3

机译:纳米晶La_(0.7)Sr_(0.3)CoO_3的热电和磁性能

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摘要

This work reports on the effect of grain size on the electrical, thermal, and magnetic properties of La_(0.7)Sr_(0.3)CoO_3 samples obtained by solid-state reaction combined with ball milling. Electrical characterization made for samples with grain sizes ranging from 26 nm to 0.57 μm shows a size-induced metal-to-insulator transition for the sample with smallest grain size. As a consequence of the grain size reduction, there is a change of the thermopower sign and the thermal conductivity displays extremely low values. Interestingly, the thermoelectric figure of merit displays an enhancement as a consequence of the grain size reduction. The Curie temperature was found to be constant whereas the saturation magnetization decreases as grain size decreases. Thereby electrical and magnetic properties of nanocrystalline samples are interpreted in terms of a core-shell structure in which grain boundaries display an insulating behavior while the core region of each grain exhibits the bulk properties.
机译:这项工作报告了晶粒大小对通过固态反应与球磨相结合获得的La_(0.7)Sr_(0.3)CoO_3样品的电,热和磁性能的影响。对粒径范围从26 nm到0.57μm的样品的电学表征表明,对于最小粒径的样品,尺寸引起了金属到绝缘体的转变。由于晶粒尺寸减小,热功率符号发生变化,并且热导率显示出极低的值。有趣的是,由于晶粒尺寸减小,热电性能因数显示出提高。发现居里温度是恒定的,而饱和磁化强度随着晶粒尺寸的减小而减小。因此,根据核-壳结构来解释纳米晶样品的电学和磁学性质,其中晶界显示出绝缘行为,而每个晶粒的核区显示出整体性质。

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.063722.1-063722.7|共7页
  • 作者单位

    Institute of Solid State Physics, TuWien, Wiedner Hauptstrasse 810, A-1040 Wien, Austria;

    Institute Physical Chemistry, University of Vienna, Wdhringgerstrasse 42, A-1090 Wien, Austria;

    Institute Physical Chemistry, University of Vienna, Wdhringgerstrasse 42, A-1090 Wien, Austria;

    Institute of Solid State Physics, TuWien, Wiedner Hauptstrasse 810, A-1040 Wien, Austria;

    Institute of Solid State Physics, TuWien, Wiedner Hauptstrasse 810, A-1040 Wien, Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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