caa a22 4500 463226496 CHVBK 20180405153228.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1637-3 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1637-3 Power generation of the touching Cu/Bi-Te/Cu composites under the periodically alternating temperature gradients [Elektronische Daten] [Osamu Yamashita, Hirotaka Odahara, Takahiro Ochi] The thermo-emf ΔV of the touching p- and n-type Cu/Bi-Te/Cu composites with different thicknesses of t Bi-Te and t Cu was measured as a function of time by alternating the temperature difference ΔT at periods of T=20, 60, 120, 240 and ∞ sec, where t Bi-Te was varied from 0.1 to 2.0mm and t Cu from 0 to 4.0mm. As a result, ΔV changes significantly with t Bi-Te, t Cu and T. The effective thermo-emf ΔV eff increases significantly with an increase of 1/T and exhibited a local maximum at 1/T=1/240s−1. The resultant | α | and the effective temperature difference ΔT eff were increased significantly by optimizing t Bi-Te and t Cu at 1/T=1/240s−1. The power generation ΔW eff (= ΔV eff 2 /4R calc) estimated using the measured ΔV eff and calculated R calc also exhibited a local maximum at 1/240s−1 for an optimum combination of t Bi-Te = 0.1mm and t Cu = 2.0mm, so that the maxima ΔW eff at 1/T = 1/240s−1 for the p- and n-type composites were 2.28 and 2.92 times higher than those obtained at 1/T=0s−1. This significant increase in ΔW eff is owing to both the increase in ΔT eff and the increase in ZT due to the increase in |α|. The power generation was thus found to be enhanced significantly by imposing the alternating temperature gradients on touching Cu/Bi-Te/Cu composites. Springer Science+Business Media, LLC, 2007 Yamashita Osamu Materials Science, Co., Ltd, 5-5-44, Minamikasugaoka, Ibaraki, 567-0046, Osaka, Japan aut Odahara Hirotaka Advanced Materials, Co., Ltd, 4-6-10, Kizuri, Higashiosaka, 577-0827, Osaka, Japan aut Ochi Takahiro Faculty of Engineering, Ehime University, 790-8577, Bunkyocho, Matsuyama, Japan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7832-7842 0022-2461 42:18<7832 2007 42 10853 https://doi.org/10.1007/s10853-007-1637-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1637-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamashita Osamu Materials Science, Co., Ltd, 5-5-44, Minamikasugaoka, Ibaraki, 567-0046, Osaka, Japan aut NATIONALLICENCE 700 1- Odahara Hirotaka Advanced Materials, Co., Ltd, 4-6-10, Kizuri, Higashiosaka, 577-0827, Osaka, Japan aut NATIONALLICENCE 700 1- Ochi Takahiro Faculty of Engineering, Ehime University, 790-8577, Bunkyocho, Matsuyama, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/18(2007-09-01), 7832-7842 0022-2461 42:18<7832 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer