Composite thermoelectric device (CTD) with a sandwich structure in which a disk of thermoelectric material is sandwiched between two cylinders of materials and . The direction of the temperature gradient is along the cylindrical axis of the device.
Fabrication method of composite devices welded with Bi.
Photographs of a welded thermoelectric device (a) and two boundaries welded with Bi (b).
Resultants and as a function of for welded devices composed of (a), (b), and (c). The solid and dashed curves denote and calculated from Eqs. (1) and (7), respectively, using the experimental values, as listed in Table I. The dotted curves are obtained by multiplying the dashed curves by a factor of , so that reproduces well the observed values.
Resultant as a function of for welded devices composed of (a), (b), and (c). The solid curves denote values calculated from Eq. (8), using the experimental values, as listed in Table I. The dashed curves for deices (a)–(c) are calculated using and other thermoelectric properties of component materials, where a value of was used for device (a) alone.
Electrical resistivities and Seebeck coefficients measured at 298 K for pure cylindrical rods of Cu, Ni, and Bi with a length of 20 mm and a diameter of 5 mm.
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