Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite. Issue 12 (21st August 2017)

• Record Type: Journal Article
• Authors: Reimann, Timmy; Bochmann, Arne; Vogel, Andy; Capraro, Beate; Teichert, Steffen; Töpfer, Jörg
• Is Part Of: Journal of the American Ceramic Society. Volume 100:Issue 12(2017)
• Page Start: 5700
• Page End: 5708
• Publication Date: 2017-08-21
• Subjects: multilayer -- thermoelectric generator -- thermoelectric oxides; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15119
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The sintering behavior and thermoelectric performance of Ca0.99 Gd0.01 Mn0.99 W0.01 O3 was studied, and a multilayer thermoelectric generator was fabricated. The addition of CuO as sintering additive was found to be effective for the reduction in the sintering temperature from 1300°C to about 1000°C‐1050°C. Dense samples were obtained after firing at 1050°C, whereas some porosity remained after firing at 1000°C. Samples sintered at reduced temperature exhibit lower electrical conductivity, whereas the Seebeck coefficient S = −150 μV/K at 100°C is not affected by lowering the sintering temperature. The figure of merit is ZT = 0.12 at 700°C for samples sintered at 1300°C; ZT = 0.08 and 0.03 were obtained for multilayer laminates sintered at 1050°C and 1000°C, respectively. A transversal multilayer thermoelectric generator (TMLTEG) was built by stacking layers of substituted CaMnO3 green tapes, and printing AgPd conductor stripes onto the thermoelectric layers at an angle of 30° relative to the direction of the heat flow. The multilayer stack was co‐fired at 1000°C. The TMLTEG has a power output of 2.5 mW at ∆ T = 200 K in the temperature interval of 25°C‐300°C. A meander‐like generator with larger power output comprising six TMTEGs is also presented.