A possibility of the new type Peltier refrigerator using a high-
Tc superconductor as passive thermo-element has been investigated near the liquid nitrogen temperature. In a normal type Peltier refrigerator, a pair of the n-type semiconductor and the p-type one are usually used. However, at low temperatures no effective p-type material has been found out, though the Bi-Sb alloy is well known to be the promising candidate for the n-type material. Therefore, in this paper we have tried to use the high-
Tc superconductor instead of the p-type material. With the Peltier refrigerator composed of the n-type Bi
88Sb
12 semiconductor and the Bi-2223 high-
Tc superconductor, a cooling has been demonstrated and a maximum temperature difference of 6.6K has been obtained when the temperature of the hot junction is 78K. Besides the improvement in the performance of the Peltier refrigerator has been achieved by reducing the cross section of the superconductor.
View full abstract