Year: 1965
Type: article
Abstract: Bi2Te3, Sb2Te3, Bi2Se3, and their solid solution alloys were prepared by application of ultrasonic vibration in order to improve their thermoelectric properties. The ultrasonically prepared sample showed thermal conductivity 3∼23% smaller and electric resistivity 3∼16% larger than those of the normally prepared one and consequently the thermoelectric figure of merit exceeded 3.2×10−3/°C.Measurements of the thermal conductivity and the Hall coefficient at a low temperature showed that the thermoelectric properties were improved by the effect of fine grained crystals and internal defects. Further, X-ray diffractometric analysis qualitatively verifies this effect.The electric current which gives the maximum cooling efficiency for this material can be reduced by about 20% because of the high electric resistivity. The thermoelectric modules composed of these materials can be applied to cooling parts which require a high temperature difference because of the low thermal conductivity.
Authors: Yoshinori Onodera, Takeshi Ishihara
Institutions: Panasonic (Japan), Panasonic (China)
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2607124990