Relationship between growth rate and undercooling in Pt-added Y1Ba2Cu3O7-x

Y1Ba2Cu3O7-x (Y123) crystals were grown by two different methods, the constant undercooling solidification and the continual cooling method, with top seeding by Sm123 seed crystals in order to investigate a relationship between undercooling (Delta T) and a growth rate (R). The crystals of Y123 with a sharp faceted interface, which consisted of {100} and {001} faces, grew epitaxially from the seed, It was found that the growth rates of {100} face (Ra) and that of {100} face (Rc) showed an increasing trend with increasing Delta T, and Rc was faster than Ra within these experimental conditions, Delta T < 20 K. The relation between R and Delta T follows the parabolic equation, viz. Ra proportional to Delta T-1.9 and Rc proportional to Delta T-1.3 for {100} and {001} faces, respectively. The simulated crystal size using the R and Delta T relations obtained from the constant undercooling method showed good agreement with experimental data by the continual cooling.