26 May 1998 Critical-current density enhancement in HTSC ceramics under CO2 laser irradiation and short-time thermal annealing
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Proceedings Volume 3404, ALT'97 International Conference on Laser Surface Processing; (1998) https://doi.org/10.1117/12.308621
Event: ALT '97 International Conference on Laser Surface Processing, 1997, Limoges, France
Abstract
We report the results of designed method of the recrystallization of Bi(2212,2223) and YBCO(123) HTSC ceramics, consisting of laser amorphization and short-time thermal annealing, which was used to enhance the structure and the transport properties of HTCS ceramics prepared by pressing. Cw CO2 laser ((lambda) equals 10.6 micrometers ) with the average power 100 W was used as a laser source. Short- duration melting of high-Tc superconducting ceramics by CO2 laser, in combination with a short heat treatment, produced a denser fine-grained structure (grain size 2 - 3 micrometers ). The resultant structure contributed to a considerable increase in the critical current of the superconductors: in 1 - 2 orders of magnitude depending on a type of the material at 77 K and 2 - 3 orders at 20 K. Our results demonstrate the feasibility of laser amorphization of HTSC ceramics in an almost single-phase state with its chemical composition close the composition of the initial unmelted compound and with an almost unchanged area of the fused zone. Heat treatment of this amorphized zone restored the chemical composition to its initial ratio and made it possible to form grains of different types.
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G. N. Mikhailova, Alexander M. Prokhorov, A. V. Troitskii, B. P. Mikhailov, D. I. Grigorashev, P. E. Kazin, V. V. Lennikov, T. D. Aksenova, "Critical-current density enhancement in HTSC ceramics under CO2 laser irradiation and short-time thermal annealing", Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308621; https://doi.org/10.1117/12.308621
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