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

F. Frangi, I. Monot, Masato Murakami

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)2708-2714
Number of pages7
JournalJournal of Materials Research
Volume10
Issue number11
Publication statusPublished - 1995 Nov
Externally publishedYes

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Powders
Thermal gradients
temperature gradients
cross sections
Nucleation
Processing
Furnaces
nucleation
pulling
pretreatment
furnaces
gradients
optimization
Direction compound

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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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.",
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