TY - JOUR
T1 - Thermoelectric properties of polygrained icosahedral Al 71-xGaxPd20Mn9 (x=0,2,3,4) quasicrystals
AU - Takagiwa, Y.
AU - Kamimura, T.
AU - Hosoi, S.
AU - Okada, J. T.
AU - Kimura, K.
N1 - Funding Information:
One of the authors (Y.T.) acknowledges support for this work by a grant from Research Fellowships of the Japan Society for the Promotion of Science (JSPS), and this work was partly supported by KAKENHI No. 19051005 and No. 19360286. FIG. 1. XRD patterns of the Al 71 − x Ga x Pd 20 Mn 9 ( x = 0 , 2 , 3 , 4 ) quasicrystals. FIG. 2. Temperature dependence of (a) electrical conductivity σ and (b) Seebeck coefficient S of the Al 71 − x Ga x Pd 20 Mn 9 ( x = 0 , 2 , 3 , 4 ) quasicrystals. FIG. 3. (a) Total thermal conductivity κ total , (b) electronic thermal conductivity κ el , estimated using the Wiedemann–Franz low, and (c) lattice thermal conductivity κ lattice , estimated by subtracting κ el from κ total , of the Al 71 − x Ga x Pd 20 Mn 9 ( x = 0 , 2 , 3 , 4 ) quasicrystals as a function of temperature. The dashed line is calculated minimum lattice thermal conductivity κ min for the Al 71 Pd 20 Mn 9 quasicrystal. FIG. 4. Temperature dependence of dimensionless figure of merit Z T of the Al 71 − x Ga x Pd 20 Mn 9 ( x = 0 , 2 , 3 , 4 ) quasicrystals.
PY - 2008
Y1 - 2008
N2 - The electrical and thermal transport properties of quaternary icosahedral Al71-x Gax Pd20 Mn9 (x=0,2,3,4) quasicrystals, obtained by replacing Al in icosahedral Al-Pd-Mn quasicrystal with Ga, have been measured in accordance with the guiding principle of "weakly bonded rigid heavy clusters" (WBRHCs). While the electrical conductivity and Seebeck coefficient were not dramatically changed, the thermal conductivity effectively decreased with increasing Ga concentration except for the sample with x=4. Although the thermoelectric properties do not obey the WBRHCs, the dimensionless figure of merit increased by a factor of 1.4 from 0.18 for Al71 Pd20 Mn9 to 0.26 for Al68 Ga3 Pd20 Mn9 quasicrystal.
AB - The electrical and thermal transport properties of quaternary icosahedral Al71-x Gax Pd20 Mn9 (x=0,2,3,4) quasicrystals, obtained by replacing Al in icosahedral Al-Pd-Mn quasicrystal with Ga, have been measured in accordance with the guiding principle of "weakly bonded rigid heavy clusters" (WBRHCs). While the electrical conductivity and Seebeck coefficient were not dramatically changed, the thermal conductivity effectively decreased with increasing Ga concentration except for the sample with x=4. Although the thermoelectric properties do not obey the WBRHCs, the dimensionless figure of merit increased by a factor of 1.4 from 0.18 for Al71 Pd20 Mn9 to 0.26 for Al68 Ga3 Pd20 Mn9 quasicrystal.
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U2 - 10.1063/1.2990772
DO - 10.1063/1.2990772
M3 - Article
AN - SCOPUS:54049127733
SN - 0021-8979
VL - 104
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 7
M1 - 073721
ER -