Abstract
Solidification studies of YBa 2 Cu 3 O 7+x have been performed under oxygen pressure 100⩽P 02 ⩽2800 bar and 1000⩽T⩽1200° C both from nearly stoichiometric and grossly nonstoichiometric (flux) melts. Crystals grown under these conditions were chemically (oxygen content volumetrically, EDAX, thermogravimetry) and structurally (electron and x-ray diffraction) characterized. The structure of the crystals grown with these two methods are different. Whereas with flux at P O2 ≥100 bar a new phase appears with a monoclinic distortion and increased oxygen content, several phases appear with stoichiometric melts. Both methods lead to superconducting crystals. For reasons of comparison large crystal platelets (up to 6x4x0,1mm 3 ) have been grown from nonstoichiometric melts at ambient pressures in Al 2 O 3 crucibles.
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