INFLUENCE OF MAGNETIC-FIELD ON VERTICAL BRIDGMAN-STOCKBARGER GROWTH OF INXGA1-XSB

Ingots of InxGa1 - Sb 9 mm diameter x 60 mm long showed 50% fewer straight boundaries and 30% fewer curved boundaries when solidified vertically with a 4 kilogauss horizontal magnetic field. The magnetic field almost entirely stopped formation of curved boundaries and greatly reduced formation of twins. There was no noticeable change in the normal rate of growing-out of grains and twins formed in the initial nucleation of the solid on the end of the silica ampoule. The reduction is attributed to the elimination of temperature fluctuations, which probably cause formation of grains and twins during freezing rate fluctuations due to transient constitutional supercooling. © 1978.