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Some properties of YBam Cu1+m O-y (m=2, 3, 4, 5) superconductors

TitleSome properties of YBam Cu1+m O-y (m=2, 3, 4, 5) superconductors
Publication TypeJournal Article
Year of Publication2558
Authorsปิยะมาศ ไชยนอก
JournalINTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume29
Issue9
Date PublishedAPR 10 2015
Type of Articleบทความวิจัย
ISSN0217-9792
Accession NumberWOS:000352508600005
Keywordscritical temperature, oxygen content, solid state reaction, YBaCuO superconductors
Abstract

We synthesized the YBamCu1+mOy superconductors; m = 2, 3, 4, 5 that were Y123 (YBa2Cu3O7-x), Y134 (YBa3Cu4O9-x), Y145 (YBa4Cu5O11-x), Y156 (YBa5Cu6O13-x), by solid state reaction with the Y2O3, BaCO3 and CuO as the beginning materials. The calcination temperature was 950. C and varied the sintering temperature to be 950. C and 980. C. The resistivity measurement by four-point-probe technique showed that the T-c(onset) of Y123, Y134, Y145, Y156 were at 97, 93, 91, 85 K, respectively. The XRD and Rietveld full-profile analysis method were used and found that the crystal structure was in the orthorhombic with Pmmm space group with the ratio c/a were 3.0, 4.0, 5.0 and 6.0 for Y123, Y134, Y145 and Y156, respectively. The oxygen content was characterized by Iodometric titration. The (Cu3+/Cu2+ and Oxygen content) were (0.28, 6.83), (0.19, 8.81), (0.13, 10.79), (0.16, 12.92) of Y123, Y134, Y145, Y156, respectively. We also found that the increasing of sintering temperature has reduced the oxygen content and the critical temperature of all samples.

URLhttps://www.worldscientific.com/doi/pdf/10.1142/S0217979215500605
DOI10.1142/S0217979215500605
Reprint EditionChainok, P (reprint author)