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首页> 外文期刊>Japanese journal of applied physics >The Effect of Microstructure on the Thermoelectric Properties of Polycrystalline Higher Manganese Silicides
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The Effect of Microstructure on the Thermoelectric Properties of Polycrystalline Higher Manganese Silicides

机译：微观结构对多晶高锰硅化物热电性能的影响

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摘要

In order to obtain single-phase higher manganese silicides (HMS) and investigate the effect of sintering conditions on the thermoelectric properties of a HMS system, HMS compounds were synthesized using a vacuum induction melting method and sintered using spark plasma sintering (SPS) and hot pressing methods. Single-phase HMS with a small amount of second phases was obtained in all of the HMS samples produced. Changes in the electrical conductivity and Seebeck coefficient of the HMS were observed when the sintering temperature was changed, which can be attributed to the presence of the second phases. Similar changes of thermoelectric properties were observed in both the SPS and hot-pressed samples. However, the electrical conductivity and Seebeck coefficient of HMS samples (SPS-HMS) were higher than those of the hot-pressed samples, which can be attributed to SPS's shorter holding time and its ability to control the diffusion rate. The SPS-HMS sample sintered at 1123 K (1123 K SPS-HMS) had a higher figure of merit than any other sample although the sample had a lower power factor. The high value of the figure of merit of the sample can be attributed to its low thermal conductivity. The highest figure of merit value of 0.41 was measured at 850 K in the 1123 K SPS-HMS, which is comparable to the results reported earlier. The results of the present study can be used to optimize the fabrication process of HMS thermoelectric materials.
机译：为了获得单相高锰硅化物（HMS）并研究烧结条件对HMS系统热电性能的影响，采用真空感应熔化法合成了HMS化合物，并使用火花等离子体烧结（SPS）和热法进行了烧结。压制方法。在所有生成的HMS样品中均获得了具有少量第二相的单相HMS。当改变烧结温度时，观察到HMS的电导率和塞贝克系数的变化，这可以归因于第二相的存在。在SPS和热压样品中均观察到热电特性的类似变化。但是，HMS样品（SPS-HMS）的电导率和塞贝克系数高于热压样品，这可以归因于SPS的保持时间较短和控制扩散速率的能力。尽管样品的功率因数较低，但以1123 K烧结的SPS-HMS样品（1123 K SPS-HMS）具有更高的品质因数。样品的品质因数的高值可归因于其低的热导率。在1123 K SPS-HMS中，在850 K处测得的最高品质因数值为0.41，这与之前报道的结果相当。本研究的结果可用于优化HMS热电材料的制造工艺。

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  • 来源
    《Japanese journal of applied physics》 |2013年第10issue2期|10MC11.1-10MC11.5|共5页
  • 作者

    Tae-Ho An; Soon-Mok Choi; Won-Seon Seo; Chan Park; Il-Ho Kim; Sun-Uk Kim;

  • 作者单位

    Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET),Seoul 153-801, Republic of Korea,Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea;

    School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education,Cheonan, Chungnam 330-708, Republic of Korea;

    Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology (KICET),Seoul 153-801, Republic of Korea;

    Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea;

    Department of Material Science and Engineering, Korea National University of Transportation,Chungju, Chungbuk 380-702, Republic of Korea;

    Functional Materials Research Department, Research Institute of Industrial Science and Technology (RIST),Pohang, Gyeongbuk 790-330, Republic of Korea;

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