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

Autor:	Shaochen Chen, Yao Zhehe, Wang Hui, Yang Li, Tiejun Zhu, Deqing Mei
Rok vydání:	2015
Předmět:	Materials science Phonon scattering Mechanical Engineering Doping Metallurgy Electron Condensed Matter Physics Microstructure Lattice thermal conductivity Mechanics of Materials Thermoelectric effect General Materials Science Grain boundary Composite material Ball mill
Zdroj:	Materials Letters. 140:103-106
ISSN:	0167-577X
Popis:	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 conductivity κ lat . In this study, nanostructured Na 0.02 Pb 0.98 Te 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. The κ lat values 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. The κ lat reached a minimum value of 0.74 W m −1 K −1 at 623 K.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9a10fd48bf3cec51e019363dce2862aa https://doi.org/10.1016/j.matlet.2014.11.015 Zobrazit plný text záznamu Full Text from ScienceDirect