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
影响因子:
3
通讯作者:
Chen S.
中科院分区:
文献类型:
--
作者:
Wang H.;Yao Z.;Zhu T.;Chen S.
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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