The effect of ageing on YBa2Cu3O7-x obtained by the photoacoustic method
AutoriNikolić, Pantelija M.
Vujatović, Stevan S.
Ostala autorstvaRistić, Momčilo M.
Članak u časopisu (Objavljena verzija)
MetapodaciPrikaz svih podataka o dokumentu
Thermal diffusivity and electric transport properties of fourteen years old superconducting YBa2Cu3O7-x pellets were obtained using the photoacoustic transmission technique and then compared with freshly made superconducting samples. The theoretical model for photoacoustic (PA) detection configuration is given. The measured amplitude and phase PA signals, as a function of the modulation frequency, were numerically analyzed. The thermal diffusivity, the coefficient of the carrier diffusion, optical absorption coefficient and the excess carrier lifetime were calculated. The thermal diffusivity of freshly produced samples decreased, after ageing, from about 1.3·10-6 to about 6.1·10-7 m2/s.
Ključne reči:superconductor / ageing / YBa2Cu3O7-x / photoacoustic method
Izvor:Science of Sintering, 2003, 35, 1, 23-29
- Belgrade: International Institute for the Science of Sintering
ISSN: 1820-7413 (Online); 0350-820X (Print)