Peritectic decomposition of barium-yttrium cuprate YBa2Cu3Ox
V.V.Prisedsky, E.I.Volkova, I.A.Udodov
Donetsk State Technical University, 38 Artema St., 340000, Donetsk, Ukraine
Received April 7, 1998
By the method of X-ray diffraction analysis together with scanning electron microscopy, electron microprobe and thermal analysis scanning electron microscopy, electron microprobe and thermal analysis have been used to study thermal decomposition of barium-yttrium cuprate YBa2Cu3Ox above 900 oC in two ambients: air and vacuum (residual p(O2) = 700 Pa). In air, YBa2Cu3Ox undergoes peritectic decomposition at 1020o into Y2BaCuO5 and melt of barium and monovalent copper oxides. Y2BaCuO5 remains stable up to 1270o and at that temperature decomposes to Y2O3.
In vacuum, at p(O2) › 700Pa, complete peritectic decomposition of 123 phase takes place at 965o and is preceded, tarting from 925o, by nonequilibriums partial decomposition of YBa2Cu3Ox into Y2BaCuO5, YBa3Cu2Oy and BaCu2O2.
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