ACOUSTICAL EXCITATIONS OF YBA2CU3O7-X POWDERS IN A GRAVITATIONAL-FIELD

The angular distribution functions of 002 reflection intensities by me ans of X-ray pole figure peaks investigation in the pressed YBa2Cu3O7- x powder surrounding was measured. Broad peaks in the mentioned distri bution functions were detected in the case, when the sound wave of a s ome typical frequencies had propagated across the powder before the me asurement. The peaks appearance could be a consequence of preferred or ientation of the particles basal planes inside the powder. The problem of sound waves propagation inside YBa2Cu3O7-x powder placed in gravit ational field has been solved. If can be seen from the presented theor etical analysis, that quasi-orientation effect of particles inside the powder can be expected during the sound wave propagation if the condi tions are suitable. A simple method of sintered bulk YBa2Cu3O7-x mater ial preparation can. be proposed on the basis of the mentioned princip le.