Abstract
Cryogenic thermoelectric coolers have been fabricated from an active element (polycrystalline Bi0.88Sb0.12) and three different passive elements, a high-Tc superconductor (polycrystalline YBa2Cu3O7-δ), and lengths of high purity copper and aluminum wires. The results for a single couple show that for low, hot junction (sink) temperatures the superconducting element gives rise to maximum temperature drops of 6.6 degrees K at 70K and 7.3 degrees K at 75K in applied magnetic fields of 0.0 and 0.07 T, respectively. Temperature drops of∼9 and 11K, respectively, are expected for such a couple when form factors are taken into account. The copper couple with an applied magnetic field resulted in large cooling δT values at Thot = 150 and 293K, indicating the importance of metallic passive elements for intermediate sink temperatures. Performance curves for the superconductor based cryogenic thermoelectric cooler show promise with further improvement possible by the use of single crystalline Bi0.85Sb0.15.
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Mino, C.C., Cochrane, J.W., Volckmann, E.H. et al. Cryogenic thermoelectric cooler with a passive branch. J. Electron. Mater. 26, 915–921 (1997). https://doi.org/10.1007/s11664-997-0274-6
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DOI: https://doi.org/10.1007/s11664-997-0274-6