AXIALLY LINEAR SLOPES OF COMPOSITION FOR DELTA-CRYSTALS

''Delta'' crystals are solid solutions of miscible materials with larg e lattice parameter differences which contain high concentration gradi ents in one direction (parallel to a lattice plane strongly diffractin g X-rays). The system GaSb-InSb has been chosen as suitable for study. By means of a ''gradient projection method'', the growth of nearly li near composition profiles with relatively steep slopes of the lattice parameter (up to (DELTAa/aBAR)/DELTAz = 8.3% cm-1), adjustable by the temperature gradient, have been performed. However, the grown ingots w ere not monocrystalline due to the use of too high a growth rate.