The lattice thermal conductivity of the Al-Mn-Si C54-phase, which possesses a large magnitude of the Seebeck coefficient and metallic electrical conduction, was greatly reduced by partial substitution of the heavy elements Ru and Re for Mn; these were selected by first principles calculations so as not to produce impurity states near the chemical potential. The heavy element substituted Al-Mn-Si-based C54-phase showed a drastic increase in the dimensionless of figure of merit ZT due to the reduction of the lattice thermal conductivity together with the unchanged electrical properties. The maximum ZT value of the p-type sample and the n-type sample reached 0.12 at 520 K and 0.38 at 540 K, respectively. These values are about five times larger than that of the heavy element-free Al-Mn-Si C54-phase.

1.
A. F.
Ioffe
,
Semiconductor Thermoelements and Thermoelectric Cooling
(
Infosearch Limited
,
London
,
1957
), pp.
1
35
.
2.
H. J.
Goldsmid
,
A. R.
Sheard
, and
D. A.
Wright
,
Br. J. Appl. Phys.
9
,
365
(
1958
).
3.
G. E.
Smith
and
R.
Wolfe
,
J. Appl. Phys.
33
,
841
846
(
1962
).
4.
R. W.
Fritts
, in
Thermoelectric Materials and Devices
, edited by
I. B.
Cadoff
and
E.
Miller
(Reinhold, New York,
1960
),
143
162
.
5.
T.
Takeuchi
,
Mater. Trans.
50
,
2359
2365
(
2009
).
6.
N. F.
Mott
and
H.
Jones
,
The Theory of the Properties of Metals and Alloys
(
Clarendon Press
,
Oxford
,
1960
), pp.
308
314
.
7.
T.
Kondo
,
T.
Takeuchi
,
S.
Tsuda
, and
S.
Shin
,
Phys. Rev. B
74
,
224511
(
2006
).
8.
T.
Takeuchi
,
T.
Otagiri
,
H.
Sakagami
,
T.
Kondo
,
U.
Mizutani
, and
H.
Sato
,
Phys. Rev. B
70
,
144202
(
2004
).
9.
T.
Takeuchi
,
N.
Nagasako
,
R.
Asahi
, and
U.
Mizutani
,
Phys. Rev. B
74
,
054206
(
2006
).
10.
T.
Takeuchi
,
Y.
Toyama
,
A.
Yamamoto
,
H.
Hazama
, and
R.
Asahi
,
Mater. Trans.
51
,
1127
1135
(
2010
).
11.
P. G.
Klemens
,
Proc. Phys. Soc. London, Ser. A.
68
,
1113
(
1955
).
12.
A. F.
Ioffe
and
A. R.
Regel
,
Prog. Semicond.
4
,
237
(
1960
).
13.
Y.
Takagiwa
,
Y.
Matsubayashi
,
A.
Suzumura
,
J. T.
Okada
, and
K.
Kimura
,
Mater. Trans.
51
,
988
993
(
2010
).
14.
A.
Yamamoto
and
T.
Takeuchi
,
J. Electron. Mater.
41
,
1743
1748
(
2012
).
15.
P.
Blaha
,
K.
Schwarz
,
G. K. H.
Madsen
,
D.
Kvasnicka
, and
J.
Luitz
, in
WIEN 2K, An Augmented Plane Wave + Local Orbitals Program for Calculating Crystal Properties
, edited by
K.
Schwarz
(
Technische Universitat
,
Wien, Austria
,
2001
).
17.
H.
Adachi
,
M.
Tsukada
, and
C.
Satoko
,
J. Phys. Soc. Jpn.
45
,
875
(
1978
).
18.
Y.
Terazawa
,
M.
Mikami
, and
T.
Takeuchi
,
J. Electron. Mater.
41
,
1348
1353
(
2012
).
19.
T.
Takeuchi
,
T.
Onogi
,
E.
Banno
, and
U.
Mizutani
,
Mater. Trans.
42
,
933
938
(
2001
).
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