caa a22 4500 463229061 CHVBK 20180405153236.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-1457-x doi (NATIONALLICENCE)springer-10.1007/s10853-006-1457-x Crystal microstructure suitable for high-performance thermoelectric bulk materials [Elektronische Daten] [Osamu Yamashita, Hirotaka Odahara] The resultant thermoelectric power factor P and figure of merit Z of two types of composite device composed of a sandwich structure (A/B/A) were calculated by treating these devices electrical and thermal circuits. When the direction of the temperature gradient is perpendicular to a sandwiched slab with a lower ρ and a higher κ than those of the dominant material (a) and is parallel to a slab with a higher ρ and a lower κ than those of the dominant material (b), P increased significantly at an optimum slab thickness for device (a), in accordance with the result obtained by Bergman and Fel for a similar composite device, but decreased abruptly with increasing slab thickness for device (b), while Z remained almost unchanged with slab thickness for both devices as long as a thin slab is used. It was clarified that well-known high-performance thermoelectrics have crystal structures or microstructures corresponding to either device (a) or (b) fitted to enhance the boundary effect at the interface. Therefore, it is expected that when a number of thinly layered phases aligned in one direction are introduced into the microstructures of high-performance bulk materials; they enable the significant enhancement of boundary effect alone, resulting in a significant increase in Z of such bulk materials. Springer Science+Business Media, LLC, 2007 Yamashita Osamu Faculty of Engineering, Ehime University, Bunkyocho, 790-8577, Matsuyama, Japan aut Odahara Hirotaka Faculty of Engineering, Ehime University, Bunkyocho, 790-8577, Matsuyama, Japan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5867-5874 0022-2461 42:14<5867 2007 42 10853 https://doi.org/10.1007/s10853-006-1457-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1457-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamashita Osamu Faculty of Engineering, Ehime University, Bunkyocho, 790-8577, Matsuyama, Japan aut NATIONALLICENCE 700 1- Odahara Hirotaka Faculty of Engineering, Ehime University, Bunkyocho, 790-8577, Matsuyama, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/14(2007-07-01), 5867-5874 0022-2461 42:14<5867 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer