Reduced lattice thermal conductivity in nanograined Na-doped PbTe alloys by ball milling and semisolid powder processing

Reduced lattice thermal conductivity in nanograined Na-doped PbTe alloys by ball milling and semisolid powder processing
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通过球磨和半固态粉末加工降低纳米晶 Na 掺杂 PbTe 合金的晶格热导率

DOI:
10.1016/j.matlet.2014.11.015
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发表时间:
2015-02
期刊:
影响因子:
3
通讯作者:
Chen S.
Chen S.
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang H.;Yao Z.;Zhu T.;Chen S.

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在块状PbTe基合金中实现小于100 nm的晶粒是具有挑战性的,并且还可以通过降低晶格热导率κlat来改善合金的热电性能。在这项研究中,纳米结构的Na 0. 02 Pb 0. 98 Te的晶粒尺寸为20-100 nm的样品制备的高能球磨和半固态粉末加工。显微结构进行了研究,通过扫描和透射电子显微镜。与晶粒尺寸大于100 nm的参考样品相比,样品的κ晶格值显著降低,这主要是由于晶界处声子散射较强。在623 K时,κ lat达到最小值0.74 W m− 1 K − 1。
Achieving grains of less than 100 nm in bulk PbTe-based alloys is challenging, and yet can improve the thermoelectric performance of the alloys by reducing lattice thermal conductivityκlat. In this study, nanostructured Na0.02Pb0.98Te samples with grain sizes of 20–100 nm were fabricated by high energy ball milling and semisolid powder processing. Microstructures were investigated by scanning and transmission electron microscopies. Theκlatvalues of the samples showed significant reductions compared with those of reference samples with grains larger than 100 nm, mainly due to stronger phonon scattering at grain boundaries. Theκlatreached a minimum value of 0.74 W m−1K−1at 623 K.
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