The effect of phase-segregated Heusler on high temperature thermoelectric properties of bulk half-Heusler TiNiSn has been studied. In samples expressed by the composition , a significant decrease in thermal conductivity (between 10% and 30%) is observed for two-phase , despite the second-phase particles existing at the micrometer scale; a 50% increase in the electrical conductivity is also measured. These result in a maximum figure of merit, ZT, of 0.44 at 800 K, which is 25% greater than is observed for the x = 0 sample. Density functional calculations of TiNiSn and suggest that the latter should deplete carriers at 0 K.
REFERENCES
1.
J. R.
Sootsman
, D. Y.
Chung
, and M. G.
Kanatzidis
, Angew. Chem., Int. Ed. Engl.
48
, 8616
(2009
).2.
A.
Shakouri
, Annu. Rev. Mater. Res.
41
, 399
(2011
).3.
M.
Zebarjadi
, K.
Esfarjani
, M. S.
Dresselhaus
, Z. F.
Ren
, and G.
Chen
, Energy Environ. Sci.
5
, 5147
(2012
).4.
W.
Kim
, J.
Zide
, A.
Gossard
, D.
Klenov
, S.
Stemmer
, A.
Shakouri
, and A.
Majumdar
, Phys. Rev. Lett.
96
, 045901
(2006
).5.
J.
He
, J. R.
Sootsman
, S. N.
Girard
, J. C.
Zheng
, J.
Wen
, Y.
Zhu
, M. G.
Kanatzidis
, and V. P.
Dravid
, J. Am. Chem. Soc.
132
, 8669
(2010
).6.
C.
Yu
, T.-J.
Zhu
, R.-Z.
Shi
, Y.
Zhang
, X.-B.
Zhao
, and J.
He
, Acta Mater.
57
, 2757
(2009
).7.
S.
Bhattacharya
, T. M.
Tritt
, Y.
Xia
, V.
Ponnambalam
, S. J.
Poon
, and N.
Thadhani
, Appl. Phys. Lett.
81
, 43
(2002
).8.
H.
Hohl
, A. P.
Ramirez
, C.
Goldmann
, G.
Ernst
, B.
Wölfing
, and E.
Bucher
, J. Phys.: Condens. Matter
11
, 1697
(1999
).9.
T. J.
Zhu
, K.
Xiao
, C.
Yu
, J. J.
Shen
, S. H.
Yang
, A. J.
Zhou
, X. B.
Zhao
, and J.
He
, J. Appl. Phys.
108
, 044903
(2010
).10.
S. J.
Poon
, D.
Wu
, S.
Zhu
, W.
Xie
, T. M.
Tritt
, P.
Thomas
, and R.
Venkatasubramanian
, J. Mater. Res.
26
, 2795
(2011
).11.
Y. W.
Chai
and Y.
Kimura
, Appl. Phys. Lett.
100
, 033114
(2012
).12.
H.
Hazama
, M.
Matsubara
, R.
Asahi
, and T.
Takeuchi
. J. Appl. Phys.
110
, 063710
(2011
).13.
J. P. A.
Makongo
, D. K.
Misra
, X.
Zhou
, A.
Pant
, M. R.
Shabetai
, X.
Su
, C.
Uher
, K. L.
Stokes
, and P. F. P.
Poudeu
. J. Am. Chem. Soc.
133
, 18843
(2011
).14.
G.
Baldinozzi
, J.-F.
Bérar
, M.
Gautier-Soyer
, and G.
Calvarin
, J. Phys.: Condens. Matter
9
, 9731
(1997
).15.
G.
Kresse
and J.
Furthmüller
, Comput. Mater. Sci.
6
, 15
(1996
).16.
G.
Kresse
, M.
Marsman
, and J.
Furthmüller
, Vienna Ab-Initio Simulation Package: VASP the GUIDE, 2012
.17.
P. E.
Blöchl
, Phys. Rev. B
50
, 17953
(1994
).18.
J. P.
Perdew
, K.
Burke
, and M.
Ernzerhof
, Phys. Rev. Lett.
77
, 3865
(1996
).19.
M. C.
Flemings
, Solidification Processing
(McGraw-Hill
, New York
, 1974
).20.
D.-Y.
Jung
, K.
Kurosaki
, C.-E.
Kim
, H.
Muta
, and S.
Yama
, J. Alloys Compd.
489
, 328
(2010
).21.
F.
Casper
, T.
Graf
, S.
Chadov
, B.
Balke
, and C.
Felser
, Semicond. Sci. Technol.
27
, 063001
(2012
).22.
C. S.
Birkel
, W.
Zeier
, J. E.
Douglas
, B.
Lettiere
, C.
Mills
, G.
Seward
, A.
Birkel
, M.
Snedaker
, Y.
Zhang
, G.
Snyder
, T.
Pollock
, R.
Seshadri
, and G. D.
Stucky
, Chem. Mater.
24
, 2558
(2012
).23.
H.
Xiao
, J.
Tahir-Kheli
, and W. A.
Goddard
, J. Phys. Chem. Lett.
2
, 212
(2011
).24.
J. A.
Kurzman
, M.-S.
Miao
, and R.
Seshadri
, J. Phys.: Condens. Matter
23
, 465501
(2011
).© 2012 American Institute of Physics.
2012
American Institute of Physics
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