Effect of plastic deformation on the thermal conductivity of bismuth-thallium and bismuth-lead systems between 1.5 and 300 K
✍ Scribed by C.K. Subramaniam; K.D. Chaudhuri
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 544 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
Measurements of the thermal conductivity of superconducting specimens of bismuththallium (Bi-TI: 3.92 at% TI in Bi) and bismuth-lead (Bi-Pb: 4.00 at% Pb in Bi) were made from 1.5 to 300 K, both in the normal and the superconducting states, and the effect of plastic deformation on the thermal conductivity of these specimens was studied. The data for Bi-TI and Bi-Pb show that the heat carriers over a considerable range of temperature are essentially phonons but that electronic contributions are significant at low temperatures, both in the normal and superconducting states. At higher temperatures, appreciably above /(max, the electronic contributions can be significant because of thermal excitations across a band gap. The Debye temperature, 0D, is altered for Bi-TI and Bi-Pb, compared to that of pure Bi. Plastic deformation greatly affected the thermal conductivities of the two systems. In addition, the band gap and eD were increased with plastic deformation.