Abstract
Phase pure Ba 2YCu 3O x was exposed to atmospheres of oxygen, air, nitrogen, carbon-dioxide, carbon monoxide and ammonia. High temperature treatments show that the maximum processing temperature must stay below the incongruent melting peak, which is shown to vary with atmosphere. It is also shown that partial pressure of oxygen affects the crystal structure of the sintered material. Low temperature treatments (555°C) reveal a change of the Ba 2YCu 3O x material from a superconductor to a semiconductor, the most intriguing being a material which shows a change in sign of do/dT at 88 K, thus offering interesting applications in electrical circuits.
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