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Fully automated apparatus for thermal diffusivity measurements on high-temperature superconductors in high magnetic field.

Author(s) : CALZONA V., CIMBERLE M. R., FERDEGHINI C., PUTTI M., SIRI A. S.

Type of article: Article

Summary

Apparatus to measure the thermal diffusivity of high temperature superconductors in an extended range of temperature (10-300 K) and magnetic field (up to 8 T). Heat losses are taken into account by adopting an alternating-current technique. Effects introduced by power dissipated on the heater, and by use of thermocouples are considered. Computer controlled experiments have been made on YBCO(7) et YBCO(8). The accuracy of the measurements, mainly determined by the evaluation of the sample length, is 10%, while the sensitivity is much higher (0.1%). The method described in this paper is particularly suitable to investigate the high temperature region. The authors have estimated that, also at the higher temperatures, frequencies over 0.03 hertz keep the thermal losses low enough, but in this case the poor thermal contact of the thermocouples can be a major problem.

Details

  • Original title: Fully automated apparatus for thermal diffusivity measurements on high-temperature superconductors in high magnetic field.
  • Record ID : 1994-2764
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 64 - n. 3
  • Publication date: 1993/03
  • Document available for consultation in the library of the IIR headquarters only.

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