Thermal conductivities, electrical resistivities, and Seebeck coefficients of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} superconductors from 80 to 300 K
- Oak Ridge National Lab., TN (United States)
- DOW Chemical Co., Plaquemine, LA (United States). Louisiana Div.
Thermal conductivities, electrical resistivities, and Seebeck coefficients of three polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}x} specimens have been measured over the temperature range 80 to 300 K in a longitudinal-heat-flow apparatus. Smoothed values for thermal conductivity, and electrical resistivity have been obtained for temperatures above the superconducting transition temperature of 90 K. The thermal conductivity values decreased as the temperature was increased, a trend which is inconsistent with the results of some other investigators. The thermal conductivities were less than previously published values and it is suggested that these differences are due to radiative heat loss in the published values. This effect is especially important for linear heat flow measurements on low thermal conductivity materials. The electrical and thermal conductivities of the specimens varied with Ba content and this variation was used to separate the thermal conductivity into lattice and electronic components are significant. The phonon component exhibits the expected temperature variation and an analysis indicates that the electron-phonon interaction is unusually strong.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10111984
- Report Number(s):
- CONF-9311131-2; ON: DE94004796; TRN: AHC29402%%59
- Resource Relation:
- Conference: 22. international thermal conductivity conference,Tempe, AZ (United States),7-10 Nov 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
Similar Records
High Seebeck Coefficient and Unusually Low Thermal Conductivity Near Ambient Temperatures in Layered Compound Yb 2– x Eu x CdSb 2
High conductivity and nonlinear Seebeck coefficient of Ag{sub 2}O containing (Bi{endash}Pb{endash}Sr{endash}Ca{endash}Cu{endash}O) glassy precursors for high T{sub c} superconductors