Thermal diffusivity measurement of Zn, Ba, V, Y and Sn doped Bi-Pb-Sr-Ca-Cu-O ceramics superconductors by photoacoustic technique

• Published in: Journal of materials science 2002-03, Vol.37 (5), p.1055-1060
• Main Authors: YUNUS, W. M. M, FANNY, C. Y. J, PHING, T. E, MOHAMED, S. B, HALIM, S. A, MOKSIN, M. M
• Format: Article
• Language: English
• Subjects: Applied sciences; Barium; Bi-based cuprates; Bismuth; Building materials. Ceramics. Glasses; Calcium; Ceramic industries; Chemical industry and chemicals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Copper; Cuprates superconductors (high tc and insulating parent compounds); Diffusion length; Diffusivity; Dopants; Electrotechnical and electronic ceramics; Exact sciences and technology; High-Tc compounds; Lead; Materials science; Photoacoustic cells; Physics; Properties of type I and type II superconductors; Strontium; Superconductivity; Technical ceramics; Thermal diffusion; Thermal diffusivity; Tin; Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1014372519692

The simple open photoacoustic cell technique is demonstrated for measuring the thermal diffusivity of the Zn, Ba, V, Y and Sn doped Bi-Pb-Sr-Ca-Cu-O superconducting ceramic samples. It is based upon the measurement of the photoacoustic signal as a function of the modulation frequency in the region where the sample thickness, ls, equal to the thermal diffusion length of the sample, μs. The obtained thermal diffusivity values of Ba, V, Y and Sn doped in Bi-Pb-Sr-Ca-Cu-O system increase with the increasing dopant concentration at Ca side. However, the thermal diffusivity values of Zn doped sample decrease with the increasing of dopant concentration in the system. The measured thermal diffusivity value was found to be very dependent on the dopant atom and dopant concentration.