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Investigation of the processing conditions for the growth of large cross section meet-powder-meet-growth YBCO samples in a bidirectional temperature gradient

Published online by Cambridge University Press:  03 March 2011

F. Frangi ,
I. Monot  and
M. Murakami
F. Frangi*
Affiliation:
ISTEC, SRL, 16-25, Shibaura 1-chome, Minato-ku, Tokyo, 105, Japan
I. Monot*
Affiliation:
ISTEC, SRL, 16-25, Shibaura 1-chome, Minato-ku, Tokyo, 105, Japan
M. Murakami
Affiliation:
ISTEC, SRL, 16-25, Shibaura 1-chome, Minato-ku, Tokyo, 105, Japan
*
a)On leave from CISE S.p.A., 12081 1-20134 Milano, Italy.
b)Present address: CRISMAT-ISMRA Bd. du Marechal Juin, 14050 Caen cedex, France.
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Abstract

A bidirectional gradient furnace with sample displacement was used for the growth of large meet-powder-meet-growth (MPMG) YBCO samples. The optimization of the macrogranular structure with consequent extension of the central part of the sample, characterized by large aligned domains, was studied. Considering the large cross section of our samples, we studied the combined effects of different ratios between the longitudinal and transversal temperature gradients, different pulling rates (R = 0, 0.5, 1, and 2 mm/h), and one or more stages at the beginning of the sample growth on grain nucleation, dimension, and orientation. Different mechanical pretreatments of sample surfaces were also tested in order to control domain nucleation. We obtained 20 × 25 × 45 mm3 samples with low misoriented extended domains. Moreover, we were able to vary their c-axis directions from perpendicular to parallel with respect to the sample length.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 11 , November 1995 , pp. 2708 - 2714
Copyright
Copyright © Materials Research Society 1995

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References

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