SIMULTANEOUS MEASUREMENT OF THERMAL CONDUCTIVITY AND THERMAL DIFFUSIVITY FOR SUPERCONDUCTING THIN FILMS (YBCO) BY PHOTOTHERMAL RADIOMETRY
In the development of superconducting tape of an Yttrium system superconductor (YBa2Cu3O7-δ: YBCO), thermal evaluation is one of the most important basic technology for the superconducting electric transmission system design. Specifically, it is necessary to consider the thermal behavior of the YBCO layer perpendicular to the surface. The purpose of the present study is to measure the thermal properties (thermal conductivity and thermal diffusivity) of the vertical direction of the YBCO thin films by the photothermal radiometry (PTR) under the normal temperature environment. PTR enables a contact-free and non-destructive measurement. First, we have performed sensitivity analysis on YBCO thermal properties by using the theory that expresses PTR and have examined measurement conditions. We have measured thermal properties of the YBCO thin films (1000 nm in thickness) and compared with those of the YBCO bulk. The results indicate that the thermal conductivity and thermal diffusivity of thin film are same level as the reported value of YBCO bulk. We have measured three samples with different thicknesses (1000 nm, 500 nm and 250 nm) and examined the film thickness dependency of thermal properties.
Tetsu Ando Yoshihiro Taguchi Yuji Nagasaka
School of Integrated Design Engineering Keio University 3-14-1, Hiyoshi, Yokohama, Kanagawa 223-8522 Department of System Design Enginerring Keio University 3-14-1, Hiyoshi, Yokohama, Kanagawa 223-8522
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
492-497
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）