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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Crystallographically textured SnSe nanomaterials produced from the liquid phase sintering of nanocrystals
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Crystallographically textured SnSe nanomaterials produced from the liquid phase sintering of nanocrystals

机译：用纳米晶体的液相烧结产生的晶体形式纹理的SNSE纳米材料

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摘要

We report the thermoelectric performance of p-type nanocrystalline SnSe obtained from the liquid phase sintering of blends of SnSe nanocrystals and Te nanorods. A cycled hot press procedure at a temperature above the Te melting point promoted the formation of crystallographically textured SnSe nanomaterials with relative densities up to 93%. After consolidation, part of this Te was found within the SnSe lattice and part remained as elemental Te between the SnSe grains. The presence of Te during the SnSe consolidation resulted in SnSe nanomaterials with higher electrical conductivities and lower Seebeck coefficients and thermal conductivities. By adjusting the amount of Te, thermoelectric figures of merit (ZT) up to 1.4 at 790 K were measured in the direction of the uniaxial pressure, coinciding with the preferential a crystallographic axis. While this value matches the highest ZT value reported at this temperature for SnSe in the [100] crystal direction, the ZT values of the consolidated SnSe along the bc plane were relatively lower due to moderately low thermal conductivities in this plane.
机译：我们报告了从SNSE纳米晶体和TE纳米棒的共混物的液相烧结获得的p型纳米晶体SNSE的热电性能。在高于TE熔点的温度下循环热压过程促进了结晶纹理的SNSE纳米材料的形成，相对密度高达93％。合并后，部分TE在SNSE格子内发现，部分留在SNSE谷物之间作为元素TE。在SNSE固结期间TE的存在导致具有较高电导率的SNSE纳米材料，以及更低的塞贝克系数和导热率。通过调节TE的量，在单轴压力方向上测量高达1.4的优选（ZT）的热电图，与优先的晶体轴重合。虽然该值与在[100]晶体方向上的此温度下报告的最高ZT值匹配，但由于该平面中的中等低导热性，因此沿着BC平面的固结SNSE的ZT值相对较低。

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