# Approaches to the synthesis of High-$T_c$ superconducting oxides in La-Ba-Cu-O and Y-Ba-Cu-O systems

Bhat, V and Ganguli, A K and Nandundaswamy, KS and Ram, Mohan RA and Gopalkrishnan, J and Rao, CNR (1987) Approaches to the synthesis of High-$T_c$ superconducting oxides in La-Ba-Cu-O and Y-Ba-Cu-O systems. In: Phase Transitions, 10 (1-2). pp. 87-95.

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## Abstract

High-$T_c$ superconducting oxides of nominal $La_{1.85}Ba_ {0.15}CuO_4$ and $YBa_2Cu_3O_7$ were prepared by using nitrate, carbonate, oxalate/malonate, and citrate precursors. While the samples in the Y-system are generally monophasic $YBa_2Cu_3O_{7-\delta}$ with $T_c$ around 90K, the preparations in the La-system were biphasic containing $K_2NiF_4$-like $La_{1.85}Ba_{0.15}CuO_4$ $(T_c = 30K)$ and a perovskite-like phase with a much higher $T_c$ (200-300K). Effect of Ca, Zr, Ce, as well as S substitution in $YBa_2Cu_3O_{7-\delta}$ has also been investigated.

Item Type: Journal Article Copyright belongs to Taylor and Francis. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 04 Mar 2008 27 Aug 2008 13:12 http://eprints.iisc.ernet.in/id/eprint/13131