Abstract
The existing data on the mechanism of peritectic decomposition of the metal oxide YBa2Cu3O x are ambiguous. This process cannot be studied without quite sensitive methods of phase analysis and allowance for its dependence on the partial pressure of oxygenp(O2) in the gas phase. The methods of x-ray diffractometry, scanning electron microscopy, and local electron-probe and thermal analyses are used to study the transformations in heating YBa2Cu3O x above 900°C in air and in vacuum at a residual pressurep(O2)=700 Pa.
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