FIELD: heat treatment of materials. SUBSTANCE: device for heating and melting of refractory substance with flux of accelerated electrons includes melting pot and source of electrons. Source of electrons - emitter is built in the form of metal shell electrically insulated from walls of melting pot which embrace melting pot from outside and forms sealed gap together with sides of melting pot. Sealed gap contains filling in the form of alkali or alkaline-earth metal. This filling is located in reservoir communicating with space of gap. Metal shell is provided with heater and cooler. Sealed gap has width changing continuously or step over height of melting pot. EFFECT: most efficient in growing of monocrystalls of refractory substances, especially nonconductive ones. 4 cl, 1 dwg
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