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Characterization and Thermoelectric Properties of La 0.4 Ni 0.2 Co 3.8 Sb 12 Filled Skutterudite Prepared by the MA‐HP Method
Author(s) -
Yang Junyou,
Chen Yuehua,
Zhu Wen,
Bao Siqian,
Xingkai Duan Xi'an Fan
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.04073.x
Subject(s) - skutterudite , materials science , thermoelectric effect , nanocrystalline material , microstructure , hot pressing , seebeck coefficient , phase (matter) , metallurgy , electrical resistivity and conductivity , composite material , grain size , thermal conductivity , thermoelectric materials , nanotechnology , chemistry , thermodynamics , physics , organic chemistry , engineering , electrical engineering
La 0.4 Ni 0.2 Co 3.8 Sb 12 filled skutterudite compound was successfully prepared via the route of mechanical alloying and hot pressing (MA‐HP). Single‐phase filled skutterudite can be obtained when the mechanically alloyed powders is hot pressed for 2 h at a temperature higher than 550°C. Prolonging the hot pressing process, the electrical resistivity of the La 0.4 Ni 0.2 Co 3.8 Sb 12 filled skutterudite decreases; Seebeck coefficient increases when the hot press duration is prolonged from 2 to 4 h, and no evident change was observed on further prolonging. A composite microstructure, which consists of some coral‐like clusters and a nanocrystalline matrix with grain size about 50 nm in the La 0.4 Ni 0.2 Co 3.8 Sb 12 filled skutterudite, was observed for the first time. The coral‐like microstructure is thought to be the prime filled skutterudite phase produced directly by MA, while nanocrystalline matrix is the filled skutterudite phase formed during hot press.