Abstract
Several aspects of the Y−Ba−Cu−O phase diagram have been investigated by thermal analysis, isopiestic, and soaking methods in various gas environments in more detail. On the basis of the univariant reactions at p(O2)≈0.21×105 Pa (especially e1 and m1) and oxygen balance considerations, consequences concerning single crystal growth as well as texturing techniques have been derived. It is shown that oxygen diffusion through the melt can become an important technological factor. Phase diagram investigations at reduced oxygen partial pressure, especially the stability field of YBa2Cu3O7−δ and the pressure dependence of the e1 reaction, give rise to modified techniques of melt processing at lower temperatures.
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