Ca-substituted Y124 superconductors Y 1-x Ca x Ba 2 Cu 4 O 8 (x = 0.05, 0.1) were synthesized at ambient oxygen pressure by a solid-state reaction method which used CuI instead of the conventional CuO. Experimental results showed a promoting effect of copper iodide on the formation of the 124 phase at normal oxygen pressure. T c determined from the Meissner effect was 88 K for x = 0.05 and 90 K for x = 0.1. For the same Ca-substitution rates T c(zero-resistance) of 80.5 K and 82.0 K was obtained respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering