2015
DOI: 10.1039/c5tc01196e
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Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds

Abstract: Two successful recipes to enhance the thermoelectric performance,} namely carrier concentration optimization and reduction of thermal conductivity{,} have been combined and applied to the p-type (Ti/Zr/Hf)CoSb1-xSnx system. An intrinsic micrometer-scale phase separation increases the phonon scattering and reduces the lattice thermal conductivity. A substitution of 15 Sb by Sn optimizes the electronic properties. Starting from this{,} further improvement of the thermoelectric properties has been achieved by a f… Show more

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Cited by 71 publications
(46 citation statements)
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“…The maximal absolute value of α of ZrCo0.96Ni0.04Sb sample is 63.5 μV/K at 850 K. Moreover, the monotonic increase of α with increasing temperature indicates the single band Figure 3c. It is assumed that the single parabolic band (SPB) model and acoustic phonon scattering mechanism are appropriate for the thermoelectric material, Pisarenko plots can be derived based on the relationship between the Seebeck coefficient and DOS effective mass according to the following Formulas (1)- (3) [18,19],…”
Section: Methodsmentioning
confidence: 99%
“…The maximal absolute value of α of ZrCo0.96Ni0.04Sb sample is 63.5 μV/K at 850 K. Moreover, the monotonic increase of α with increasing temperature indicates the single band Figure 3c. It is assumed that the single parabolic band (SPB) model and acoustic phonon scattering mechanism are appropriate for the thermoelectric material, Pisarenko plots can be derived based on the relationship between the Seebeck coefficient and DOS effective mass according to the following Formulas (1)- (3) [18,19],…”
Section: Methodsmentioning
confidence: 99%
“…[8][9][10][13][14][15][16] However, not all samples containing excess Ni (y > 0) show enhancements of S and σ, and other reports observe only micro-inclusions of the FH phase. [19][20][21][22][23] Recent studies have linked the low κ to phase segregation into multiple half-Heusler phases with different ratios of X-metals. 18 The absence of clear inclusions demonstrates that the degree of segregation is sensitively dependent on the sample processing, which is in keeping with the wide variety of nanostructures reported in the literature.…”
Section: Introductionmentioning
confidence: 99%
“…Good ZT values have been reported in HfNiSn-based n-type [2][3][4][5][6] and HfCoSb-based p-type [7][8][9][10][11] half-Heusler (HH) materials. However, the use of Hf is unfavorable due to its high cost.…”
mentioning
confidence: 98%