DEVICE FOR GROWING CRYSTALS IN FORM OF RODS AND TUBES FROM MELT Russian patent published in 2002 - IPC

FIELD: growing profiled crystals by drawing them; manufacture of monocrystal tubes and rods at periodically changing content of mixture along crystal length. SUBSTANCE: device includes crucible 1 with splitter plate 2 dividing melts 3 and 4 at different content of admixtures, additional mold 5 secured in one of reservoirs of crucible (containing melt 3), shield 6 with hole 7 and mold 8 secured on this shield. Device makes it possible to obtain periodic structures at varying ratio of heights of layers of different composition in the course of growing crystals due to vertical and horizontal motion of additional mold in plane of shield by raising, lowering or rotating the crucible. Varying periodic structures may be obtained in crystal thus grown; ratio of height of layers of different composition a_i/b_i changes within (π-a)/(π+a) ≤ a_i/b_i≤ (π+a)/(π-a). EFFECT: enhanced efficiency. 2 dwg, 2 ex