The oxygen contents of oxygen-annealed T1 single layer systems were determined by iodometric titration. The oxygen contents, w, of T1Ba2Ca1-xYxCu2Ow increased with Y concentration, x, substituted for Ca. Oxygen vacancy, y, was estimated to be about. y=0.3 in oxygen-annealed T1Ba2Can-1CunO2n+3-y (n=2, 3, 4). The Cu valence of oxygen-annealed T1Ba2 Can-1CunO2n+3-y is calculated to be about 2.2+, if the hole is introduced only in the CuO2 pyramidal sheets. Square planar CuO2 planes of the T1 single layer system may not be active for superconductivity.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering