Somasundaram, P. ; Nanjundaswamy, K. S. ; Umarji, A. M. ; Rao, C. N. R. (1988) Structure and superconducting properties of YBa2−xLnxCu3O7±δ (Ln=La, Nd or Gd) and (Ln,Ln')3−xBa3+xCu6O14+δ Materials Research Bulletin, 23 (8). pp. 1139-1144. ISSN 0025-5408
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Official URL: http://www.sciencedirect.com/science/article/pii/0...
Related URL: http://dx.doi.org/10.1016/0025-5408(88)90203-6
Abstract
In YBa2−xLnxCu3O7±δ (Ln=La, Nd or Gd), the structure becomes tetragonal with increase in x and the TC of the orthorhombic phase decreases with x. Members of (Ln, Ln')3−xBa3+xCu6O14+δ (Ln=Nd or Gd) are generally tetragonal and non superconducting. Ln3Ba3Cu6O14+δ and LnBa2Cu3O7±δ (Ln=Nd or Gd) prepared by low-temperature decomposition of nitrates are also tetragonal and nonsuperconducting. Random occupation of Ba in LnBa2Cu3O7±δ or La3Ba3Cu6O14+δ appears to favour the tetragonal structure. Furthermore oxygen is less labile when La partly substituting Ba in these oxides.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Superconductors; Oxides; Rare-earths; Barium; Copper |
| ID Code: | 42345 |
| Deposited On: | 02 Jun 2011 12:04 |
| Last Modified: | 02 Jun 2011 12:04 |
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