TY - JOUR
T1 - Composition dependence of thermoelectric properties of binary narrow-gap Ga67-xRu33+x compound
AU - Takagiwa, Y.
AU - Okada, J. T.
AU - Kimura, K.
N1 - Funding Information:
This work is partly supported by the Thermal & Electric Energy Technology Foundation (TEET) and KAKENHI No. 21860021 from JSPS and Scientific Research on Priority Areas of New Materials Science Using Regulated Nano Spaces , KAKENHI No. 19051005 from MEXT .
PY - 2010/10/8
Y1 - 2010/10/8
N2 - The composition and carrier concentration variations of the thermoelectric properties of the binary narrow-gap compound Ga67-xRu33+x have been investigated. The measured samples were synthesized by a combination of arc-melting and spark plasma sintering (SPS), succeeded in crack-free samples. We report that the temperature dependences of the electrical resistivity and Seebeck coefficient of the Ga67-xRu33+x are strongly affected by nominal Ru concentration. The Seebeck coefficients showed large positive values from 170 to 350 μV K-1 at 373 K. Also, large power factors from 2.2 to 3.0 mW m-1 K-2 were obtained at 773 K. The dimensionless figures of merit ZT beneficially increased with increasing temperature and reached a maximum value of 0.50 at about 773 K.
AB - The composition and carrier concentration variations of the thermoelectric properties of the binary narrow-gap compound Ga67-xRu33+x have been investigated. The measured samples were synthesized by a combination of arc-melting and spark plasma sintering (SPS), succeeded in crack-free samples. We report that the temperature dependences of the electrical resistivity and Seebeck coefficient of the Ga67-xRu33+x are strongly affected by nominal Ru concentration. The Seebeck coefficients showed large positive values from 170 to 350 μV K-1 at 373 K. Also, large power factors from 2.2 to 3.0 mW m-1 K-2 were obtained at 773 K. The dimensionless figures of merit ZT beneficially increased with increasing temperature and reached a maximum value of 0.50 at about 773 K.
KW - Narrow-band-gap semiconductor
KW - Nowotny chimney-ladder phase
KW - Ruthenium gallide
KW - Spark plasma sintering
KW - Thermoelectric material
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U2 - 10.1016/j.jallcom.2010.07.204
DO - 10.1016/j.jallcom.2010.07.204
M3 - Article
AN - SCOPUS:77957114653
SN - 0925-8388
VL - 507
SP - 364
EP - 369
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 2
ER -