J. Phys. Colloques
Volume 51, Numéro C1, Janvier 1990Proceeding of the International Congress
Intergranular and Interphase Boundaries in materials
|Page(s)||C1-959 - C1-964|
INTERFACIAL MICROSTRUCTURE IN Y1 Ba2 Cu3 O7-δ HIGH Tc SUPERCONDUCTORSJ. ALARCO1 et G.L. DUNLOP2
1 Department of Physics, Chalmers University of Technology, S-412 96 Gothenburg, Sweden
2 Department of Mining and Metallurgical Engineering, University of Queensland, St. Lucia, Queensland 4067, Australia
The microstructures of YBa2 Cu3 O7-δ ceramics prepared from freeze dried powders and containing an excess of CuO have been studied by analytical electron microscopy. Special attention has been paid to the interfacial microstructure. It was found that a liquid phase formed during sintering between 890°C and 920°C and this promoted grain growth and densification. Both clean grain boundaries and boundaries containing an amorphous intergrhnular film, which was rich in Cu, have been observed. Both CuO and BaCuO2 were present as secondary phases.