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| 題名: | Preparation, Structure, and Peritectic Transition of RBa 1.5Sr 0.5Cu 3O y (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) Superconductors |
| 作者: | Lin, Mei-Huey;Huang, J. T.;Kao, H.-C. I.;Wang, C. M. |
| 貢獻者: | 化學系 |
| 關鍵詞: | A. oxides;A. superconductors;D. crystal structure;D. thermodynamic properties |
| 日期: | 1998-08
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| 上傳時間: | 2013-06-06T02:33:20Z
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| 出版者: | Elsevier |
| 摘要: | A series of single-phase RBa 1.5Sr 0.5Cu 3O y (R = La, Nd, Sm, Eu, Gd, Dy, Ho, and Y) compounds with a triple-perovskite unit cell has been prepared by solid-state reaction method. Samples with a larger radius of the R ion (R = La and Nd) are tetragonal, whereas those with a small er radius of the R ion (R = Sm, Eu, Gd, Dy, Ho, and Y) are orthorhombic. Unit-cell parameters of RBa 1.5Sr 0.5Cu 3O y decrease monotonically with a decrease of the radius of the R ion. A maximum at R = Nd, Sm, and Eu is found in the peritectic transition temperature (t p), the amount of oxygen loss (Δw) in this transition, and the enthalpy of fusion (ΔH f), respectively. An increase in the ΔH f is correlated with increasing t p for the respective orthorhombic and tetragonal phases of RBa 1.5Sr 0.5Cu 3O y compounds. T c of the title compounds gradually increased from 52 to 86 K with a decrease in the radius of the R ion. |
| 關聯: | Materials Research Bulletin, 33(8): 1241-1249 |
| 顯示於類別: | [化學系] 期刊論文
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