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Preparation of Ceramics (RCa)Ba2Cu4O8 (R=Y, Ho, Er, Tm and Yb) by Conventional Solid-State Reaction
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Bulk superconductors of Ca-doped RBa2Cu4O8 (R124, R=Y, Ho, Er, Tm and Yb) were synthesized at 1 atm oxygen pressure. Although little undoped Yb124 material was obtained by a conventional solid-state reaction method, a single-phase sample was obtained upon Ca doping. The solubility limit of Ca increased with decreasing ionic radius of R. The zero-resistant temperature (T
c0) for Ca-doped R124 increased with increasing Ca content. The highest T
c0 (=85.4 K) was obtained for the 5% Ca-doped Yb124 sample. In addition, T
c0 of undoped Yb124 ceramics was estimated to be about 80 K from the result for Ca-doped samples.
Title: Preparation of Ceramics (RCa)Ba2Cu4O8 (R=Y, Ho, Er, Tm and Yb) by Conventional Solid-State Reaction
Description:
Bulk superconductors of Ca-doped RBa2Cu4O8 (R124, R=Y, Ho, Er, Tm and Yb) were synthesized at 1 atm oxygen pressure.
Although little undoped Yb124 material was obtained by a conventional solid-state reaction method, a single-phase sample was obtained upon Ca doping.
The solubility limit of Ca increased with decreasing ionic radius of R.
The zero-resistant temperature (T
c0) for Ca-doped R124 increased with increasing Ca content.
The highest T
c0 (=85.
4 K) was obtained for the 5% Ca-doped Yb124 sample.
In addition, T
c0 of undoped Yb124 ceramics was estimated to be about 80 K from the result for Ca-doped samples.
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