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      Step distribution of Yb filling fraction during microstructural evolution in skutterudites

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          Abstract

          To achieve a better material for thermoelectric power generation device, filled skutterudite Yb 0.3Co 4Sb 12 samples were fabricated by melting–quenching–annealing–spark plasma sintering (SPS) method. Two sets of samples, before and after SPS, were investigated. In both the two sets of samples, the average grain size of the samples increases monotonously with the increase of annealing time, while Yb filling fraction firstly increases and then decreases. Yb not filling into the skutterudite remains at the grain boundaries in the form of Yb 2O 3 after SPS, which could be quantified by the spatially difference method of energy dispersive spectra. Step distribution of Yb filling fraction was observed in the samples annealed for 1 h, which was caused by the microstructural evolution from the peritectic phases to the skutterudite phase. The sample annealed for 3 days and SPS sintered possesses the maximum value of Yb filling fraction 0.249 and the maximum ZT value of 1.24 at 850 K. These results are helpful to better understand the microstructural evolution and Yb filling behavior in skutterudite materials.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 March 2019
          01 October 2019
          : 8
          : 1
          : 62-71
          Affiliations
          aSchool of Materials Science and Engineering and Materials Genome Institute, Shanghai University, Shanghai 200444, China
          bState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
          Author notes
          *Corresponding author: Juanjuan XING, E-mail: xingjuanjuan@ 123456shu.edu.cn
          Article
          s40145-018-0291-3
          10.1007/s40145-018-0291-3
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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