Abstract
The sorption of oxygen by the ceramic YBa 2Bu 3O 7-x directly after its first fritting is studied using acoustic emission and dilatometric methods. Also, the acoustic emission activity N and the dilatation ΔL during the process of cooling of the fitted ceramic in a current of oxygen fed in the oven below 700°C are measured. It is shown that the magnitude of the shrinkage of the fritting ceramic during the fritting is 625 μm. This value is constant up to 650°C, at which a sharp increase in N corresponding to the phase transmission into the orthorhombic phase is recorded. When the transition is completed, expansion of the ceramic started. The dilatation curve has three characteristics sections. The first and the steepest section begins after the orthorhombic transition temperature at 650°C and finishes at 605°C. The second which is the linear section extends to 385°C. The third section monotonically completes the expansion of ceramic.
Original language | English |
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Pages (from-to) | 344-347 |
Number of pages | 4 |
Journal | Russian Ultrasonics |
Volume | 25 |
Issue number | 6 |
State | Published - 1995 |
Externally published | Yes |