caa a22 4500 463221575 CHVBK 20180405153213.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1334-7 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1334-7 Temperature dependence of the local Seebeck coefficient near the boundary in touching Cu/Bi-Te/Cu composites [Elektronische Daten] [Osamu Yamashita, Hirotaka Odahara] The thermo-emf ΔV and temperature difference ΔT across the boundary were measured as functions of r and I for the touching p- and n-type Cu/Bi-Te/Cu composites composed of t Bi-Te=2.0mm and t Cu=0.3mm, where r is the distance from the boundary and I is a direct current producing ΔT which flows through two Peltier modules connected in series. The resultant Seebeck coefficient α across the boundary is obtained from the relation α=ΔV/ΔT. As a result, the resultant |α| of the touching p- and n-type composites have a great local maximum value at r≈0.03mm and decrease rapidly with further increase of r to approach the intrinsic |αBi-Te|. The maximum resultant α of the p- and n-type composites reached great values of 1,043 and −1,187μV/K at 303K corresponding to I=0.8A and of 1,477 and −725μV/K at 360K corresponding to I=2.0A. Reflecting the temperature dependence of the intrinsic αBi-Te, the maximum α of the p-type composite increases with an increase of T, while that of the n-type one decrease with an increase of T. Surprisingly, the maximum α of the p- and n-type composites have great gradients of 8.36 and −7.15μV/K2 in the range from 303 to 366K, respectively, which are 21.8 and 134 times larger in absolute value than 0.383 and −0.0535μV/K2 of the intrinsic p- and n-type αBi-Te, so that the maximum resultant α was thus found to be much more sensitive to temperature than the intrinsic αBi-Te. Moreover, the local Seebeck coefficient α l (r) derived analytically from the resultant α(r) is enhanced significantly in the narrow region below r≈0.05mm and the maximum α l values of the p- and n-type composites were found to have extremely great values of approximately 1,800μV/K at 360K and −1,400μV/K at 303K, respectively, which are approximately 7.3 and 6.5 times higher in absolute value than the intrinsic p- and n-type αBi-Te at the corresponding temperatures. Springer Science+Business Media, LLC, 2007 Yamashita Osamu Materials Science, Co., Ltd., 5-5-44, Minamikasugaoka, 567-0046, Ibaraki, Osaka, Japan aut Odahara Hirotaka Advanced Materials, Co., Ltd., 4-6-10, Kizuri, 577-0827, Higashiosaka, Osaka, Japan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6828-6836 0022-2461 42:16<6828 2007 42 10853 https://doi.org/10.1007/s10853-006-1334-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1334-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamashita Osamu Materials Science, Co., Ltd., 5-5-44, Minamikasugaoka, 567-0046, Ibaraki, Osaka, Japan aut NATIONALLICENCE 700 1- Odahara Hirotaka Advanced Materials, Co., Ltd., 4-6-10, Kizuri, 577-0827, Higashiosaka, Osaka, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6828-6836 0022-2461 42:16<6828 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer