TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=0028729411&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028729411&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/7/12/002
DO - 10.1088/0953-2048/7/12/002
M3 - Article
AN - SCOPUS:0028729411
VL - 7
SP - 891
EP - 898
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 12
M1 - 002
ER -