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Proceedings Paper

Critical-current density enhancement in HTSC ceramics under CO2 laser irradiation and short-time thermal annealing
Author(s): G. N. Mikhailova; Alexander M. Prokhorov; A. V. Troitskii; B. P. Mikhailov; D. I. Grigorashev; P. E. Kazin; V. V. Lennikov; T. D. Aksenova
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Paper 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.

Paper Details

Date Published: 26 May 1998
PDF: 4 pages
Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308621
Show Author Affiliations
G. N. Mikhailova, General Physics Institute (Russia)
Alexander M. Prokhorov, General Physics Institute (Russia)
A. V. Troitskii, General Physics Institute (Russia)
B. P. Mikhailov, A.A. Baykov Institute of Metallurgy (Russia)
D. I. Grigorashev, Moscow State Univ. (Russia)
P. E. Kazin, Moscow State Univ. (Russia)
V. V. Lennikov, Moscow State Univ. (Russia)
T. D. Aksenova, Russian Scientific Ctr. Kurchatov Institute (Russia)

Published in SPIE Proceedings Vol. 3404:
ALT'97 International Conference on Laser Surface Processing
Vladimir I. Pustovoy, Editor(s)

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