The effects of different thermal pretreatments on the magnetic properties of YBCO MPMG samples

F. Frangi; T. Higuchi; M. Deguchi; M. Murakami

doi:10.1088/0953-2048/7/12/002

The effects of different thermal pretreatments on the magnetic properties of YBCO MPMG samples

F. Frangi, T. Higuchi, M. Deguchi, M. Murakami

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

YBCO MPMG samples, with 40% Y₂BaCuO₅, (Y-211) phase excess, were prepared using different thermal pretreatments during the temperature increase up to the partially melted state. No temperature gradient was applied during the slow-cooling growth process. Presintered samples turned out to be almost single grain, while all the others were characterized by the presence of a higher number of randomly oriented domains. Presintering favours compositional homogeneity, but, most important, enhances YBa₂Cu ₃O_7-x (Y-123) phase solidification kinetics. Though various samples show similar behaviours, concerning the values of magnetization critical-current densities (J_cm) measured at 77 K (J_cm approximately=10⁴ A cm^-2 with B//c, B=1 T), levitation forces are subject to noticeable variations related to granular macrostructures and reach a peak of over 2 kg, at 77 K, in the case of presintered material.

Original language	English
Article number	002
Pages (from-to)	891-898
Number of pages	8
Journal	Superconductor Science and Technology
Volume	7
Issue number	12
DOIs	https://doi.org/10.1088/0953-2048/7/12/002
Publication status	Published - 1994 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/7/12/002

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title = "The effects of different thermal pretreatments on the magnetic properties of YBCO MPMG samples",

abstract = "YBCO MPMG samples, with 40% Y2BaCuO5, (Y-211) phase excess, were prepared using different thermal pretreatments during the temperature increase up to the partially melted state. No temperature gradient was applied during the slow-cooling growth process. Presintered samples turned out to be almost single grain, while all the others were characterized by the presence of a higher number of randomly oriented domains. Presintering favours compositional homogeneity, but, most important, enhances YBa2Cu 3O7-x (Y-123) phase solidification kinetics. Though various samples show similar behaviours, concerning the values of magnetization critical-current densities (Jcm) measured at 77 K (Jcm approximately=104 A cm-2 with B//c, B=1 T), levitation forces are subject to noticeable variations related to granular macrostructures and reach a peak of over 2 kg, at 77 K, in the case of presintered material.",

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T1 - The effects of different thermal pretreatments on the magnetic properties of YBCO MPMG samples

AU - Frangi, F.

AU - Higuchi, T.

AU - Deguchi, M.

AU - Murakami, M.

PY - 1994/12/1

Y1 - 1994/12/1

N2 - YBCO MPMG samples, with 40% Y2BaCuO5, (Y-211) phase excess, were prepared using different thermal pretreatments during the temperature increase up to the partially melted state. No temperature gradient was applied during the slow-cooling growth process. Presintered samples turned out to be almost single grain, while all the others were characterized by the presence of a higher number of randomly oriented domains. Presintering favours compositional homogeneity, but, most important, enhances YBa2Cu 3O7-x (Y-123) phase solidification kinetics. Though various samples show similar behaviours, concerning the values of magnetization critical-current densities (Jcm) measured at 77 K (Jcm approximately=104 A cm-2 with B//c, B=1 T), levitation forces are subject to noticeable variations related to granular macrostructures and reach a peak of over 2 kg, at 77 K, in the case of presintered material.

AB - YBCO MPMG samples, with 40% Y2BaCuO5, (Y-211) phase excess, were prepared using different thermal pretreatments during the temperature increase up to the partially melted state. No temperature gradient was applied during the slow-cooling growth process. Presintered samples turned out to be almost single grain, while all the others were characterized by the presence of a higher number of randomly oriented domains. Presintering favours compositional homogeneity, but, most important, enhances YBa2Cu 3O7-x (Y-123) phase solidification kinetics. Though various samples show similar behaviours, concerning the values of magnetization critical-current densities (Jcm) measured at 77 K (Jcm approximately=104 A cm-2 with B//c, B=1 T), levitation forces are subject to noticeable variations related to granular macrostructures and reach a peak of over 2 kg, at 77 K, in the case of presintered material.

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The effects of different thermal pretreatments on the magnetic properties of YBCO MPMG samples

Abstract

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