SOFT CHEMICAL-REDUCTION OF HIGH-T-C, MATERIALS BY A NEW REAGENT 2,2,6,6-TETRAMETHYL-1-HYDROXYPIPERIDINE RELATIONSHIP BETWEEN STRUCTURE AND SUPERCONDUCTIVITY

A new reagent was used for the investigation of active oxygen in solid s: 2,2,6,6 tetramethyl-1-hydroxypiperidine. It allows the determinatio n of the oxygen chemisorbed on the surface of adsorbents and catalysts quantitatively. The behaviour of active oxygen in high-T-c supercondu ctors presents a special interest, and this reagent has been used succ essfully in this case. From these experimental results the existence o f molecular oxygen in these materials can be hypothesized.