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Fabrication of a transversal multilayer thermoelectric generator with substituted calcium manganite
Author(s) -
Reimann Timmy,
Bochmann Arne,
Vogel Andy,
Capraro Beate,
Teichert Steffen,
Töpfer Jörg
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15119
Subject(s) - sintering , materials science , seebeck coefficient , thermoelectric effect , thermoelectric generator , stack (abstract data type) , composite material , fabrication , thermoelectric materials , electrical resistivity and conductivity , thermal conductivity , electrical engineering , thermodynamics , medicine , physics , alternative medicine , pathology , computer science , programming language , engineering
The sintering behavior and thermoelectric performance of Ca 0.99 Gd 0.01 Mn 0.99 W 0.01 O 3 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 CaMnO 3 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.