ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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 A(ring). 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).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.103279
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