The 8-8-20 oxygen deficient perovskite occurs in the La-Sr-Cu-O chemical system near composition La6.4Sr1.6Cu8O20. Here we show that this structure can be stabilized in the La-Ca-Cu-Ni-O system based on the composition La6.4Ca1.6Cu6Ni2O20. In the new system, a wider variation of hole concentration is possible. Transport properties of the series reveal an insulator to metal transition as a function of increasing Ca (hole) concentration. Phase stability studies suggest that Ni preferentially substitutes for octahedrally coordinated copper.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry