A structural study of chemical stability of (Y1−x
Ca
x)(Ba2−x
La
x
)Cu3O7−δ(x= 0.0, 0.2, and 0.4) |
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Authors: | H Rajagopal A Sequeira R Ganguly J V Yakhmi |
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Affiliation: | 1. Solid State Physics Division, Bhabha Atomic Research Centre, 400 085, Mumbai (Bombay), India 2. Chemistry Division, Bhabha Atomic Research Centre, 400 085, Mumbai (Bombay), India
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Abstract: | Neutron structural studies are made on (Y1?x Ca x)(Ba2?x La x )Cu3O7?δ for compositions corresponding to x=0.0, 0.2, and 0.4 in order to evaluate any correlation between the remarkably high chemical stability of the cosubstituted samples (x=0.2 and 0.4) and the structural parameters. It is suggested that the increased chemical stability is caused by a decrease in the puckering of the Cu-O planes with increase inx, causing them to flatten, which leads to a reduction in the internal stresses existing in the perovskite lattice of this technologically important material. |
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Keywords: | |
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