Calcium substitution at yttrium site in YBa2Cu3Oy

Chandrachood, M. R. ; Mulla, I. S. ; Gorwadkar, S. M. ; Sinha, A. P. B. (1990) Calcium substitution at yttrium site in YBa2Cu3Oy Applied Physics Letters, 56 (2). 183_1-183_3. ISSN 0003-6951

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We have successfully synthesized single-phase superconducting Y1-xCaxBa2Cu3Oy for 0≤ x≤ 0.4 using a coprecipitation technique. All these compounds are orthorhombic with lattice parameters a~3.83 and c varying from 11.69 to 11.67 Å . The Tc remains unchanged around 90 K. It may be noted that in these compounds Ca substitutes for Y. On the other hand, it is known that in the compounds where Ca substitutes for Ba, the structure changes to tetragonal and Tc decreases rapidly. [See G. J. Baldha, R. B. Jotania, H. H. Joshi, H. N. Pandya, and R. G. Kulkarni, Solid State Commun. 71, 839 (1989)]. Furthermore, these compositions sinter much better than pure 1:2:3 and one gets high-density pellets (⋙ 95% of total density) at relatively lower temperature (« 950 ° C).

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:High-Tc Superconductors; Copper Oxides; Copper Oxides; Barium Oxides; Calcium; Low Temperature; Experimental Data; Fabrication; Transition Temperature; Material Substitution; Crystal Lattices; Perovskites; Chemical Composition; Temperature Effects; Precipitation; Superconductivity; Type-II Superconductors
ID Code:48936
Deposited On:18 Jul 2011 10:13
Last Modified:18 Jul 2011 10:13

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