THE DEMONSTRATION OF Y2BACUO5 PARTICLE SEGREGATION IN MELT-PROCESSED YBAZCU3O7-X, THROUGH A COMPUTER VISUALIZATION MODEL

In melt-processed YBa2Cu3O7-x (123) microstructures, often unreacted Y 2BaCuO5 (211) particles are observed to be present in an inhomogeneous manner delineating distinguishable patterns. The presence of these pa tterns in 123 is more clearly observed in the case of low 211 volume c oncentration and also when the 211 particle size is small. The observe d patterns are believed to be due to 211 particle segregation in 123 d omains in specific planes during melt texture growth. In the present p aper a software program is used to draw a three-dimensional visualizat ion model to demonstrate a possible structure of 211 particle segregat ion in 123 domains and to explain the presence of observed patterns in the microstructures. The formation of such a 211 particle segregation is explained in the light of previously proposed 123 growth mechanism s.