Abstract: Single crystals are grown from a melt in a frame-mounted furnace housing consisting of a stationary top furnace member and a movable base furnace member adapted to be butt-joined to the top one, and a vertically reciprocatable crystal-pull rod with a seed crystal holder extending into the top furnace member. A crucible with a heater is arranged in the base member. The base member is movable from beneath the top furnace member to permit the pull rod and the grown crystal to be lowered for removal of the crystal without lateral movement of the pull rod and/or crystal frame. A heat insulated discharge vessel is provided for receiving and transporting the removed crystal.

Abstract: The invention relates to growing single crystals from melt. The disclosed apparatus includes a sealed chamber accommodating a crucible with the melt, the crucible being operatively connected with a drive effecting its rotation, a heater with thermal insulation means enclosing the crucible and a rod arranged coaxially with the crucible and carrying a seed holder, the rod being operatively connected with its own drive effecting its rotation and vertical displacement. In accordance with the invention, the operative connection between the crucible and its drive includes a support ring accommodated in the chamber and supporting thereon the crucible for their joint rotation during the crystal-pulling operation.

Abstract: The apparatus may be used for growing large-sized single crystals, such as optical and scintillation alkali halide single crystals, as well as semiconductor single crystals, from melt.The apparatus comprises means for pulling a single crystal from melt and a crucible made of two containers mounted coaxially in each other to define an annular space therebetween to which a charge is fed. The inner container protrudes downwards relative to the outer container, and melt is contained in the protruding portion thereof.Apertures are provided in the side wall of the inner container at the level of the bottom wall of the outer container for overflow of melt from the annular space to the inner container. Independent heaters are provided under the inner and outer container, respectively.