Some properties of YBamCu1+mOy(m = 2, 3, 4, 5) superconductors
| Autor: | Somporn Tiyasri, Wirat Wongphakdee, Tunyanop Nilkamjon, Thanarat Khuntak, Pongkaew Udomsamuthirun, Piyamas Chainok, Supphadate Sujinnapram, Sermsuk Ratreng, Thitipong Kruaehong |
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| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Materials science Condensed Matter - Superconductivity Analytical chemistry FOS: Physical sciences Sintering Statistical and Nonlinear Physics Crystal structure Condensed Matter Physics law.invention Superconductivity (cond-mat.supr-con) Iodometry law Electrical resistivity and conductivity Calcination Orthorhombic crystal system Oxygen content |
| Zdroj: | International Journal of Modern Physics B. 29:1550060 |
| ISSN: | 1793-6578 0217-9792 |
| DOI: | 10.1142/s0217979215500605 |
| Popis: | 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 Tconset of Y123, Y134, Y145, Y156 were at 97 K, 93 K, 91K, 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. Comment: 12 pages, International Journal of Modern Physics B (2015) (accept) |
| Databáze: | OpenAIRE |
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