Preparation of Oriented Orthorhombic LnBa2Cu3O7-x Polycrystals

Abstract
Tetragonal YBa2Cu3O7-x and DyBa2Cu3O7-x crystals were ground to resemble plate-like powder. Pellets of oriented tetragonal polycrystals were prepared from this powder using a uniaxial press. The tetragonal pellet was transformed into oriented orthorhombic polycrystals. The orientation of crystals was investigated by X-ray diffraction measurement and observed by SEM images. Samples exhibited zero resistance above 90 K, with a transition width of 2.0 K.