Abstract
The acoustic emission accompanying single domain nucleation, or collapse under the inhomogeneous pressure along [110]-axis was observed in gadolinium molybdate crystal. Acoustic emission processes are associated with the Barkhausen pulses. The existence of the spontaneous deformation leads to a considerable increase in the sonic wave as compared with pure ferroelectrics. The acoustic emission signal has longitudinal and shear components, the emission radiation being anisotropic. It is noted that domain collapse leads to a larger emission signal than that at the nucleation. This fact is due to a higher speed of the domain collapse. The results are compared with the theory of uncovering crack emission.
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