Heat conduction in vanadium substituted (Bi0.8Pb0.2−yVy)2Sr2Ca2Cu3Ox sintered pellets between 10 and 150 K
✍ Scribed by B. Chanda; T.K. Dey
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 826 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
The thermal conductivities of vanadium substituted (Bi o 8Pb o 2 V )2Sr2Oa2Ou30 x sintered pellets (with 0.00 ~< y ~< 0.075) have been reported, along ~ithVtl~e results of XRD, SEM, electrical resistivity and volume fraction investigations. Vanadium substitution in (Bi-Pb) cuprates decreases Too slightly, but enhances the volume of the superconducting phase by ,~ 10%. The magnitude of the thermal conductivity K was found to be influenced significantly by this substitution over the entire temperature range investigated. The experimental observations of the temperature dependences of the thermal conductivities of this system could be explained well using the Tewordt-W61khausen formulation. Our analysis also confirmed the dominant role of phonon-defect scattering near Kma x, while phonon-electron interaction becomes more important near /co and above. The phonon-electron coupling strength 2 has been estimated to lie between 0.1 ~< 2 ~< 0.2, which is close to the values reported by others for the Y-Ba-Cu-O system.