Abstract
The furnace was designed for the growth of lead selenide single crystals at 775° C. It provides an inherently high degree of temperature uniformity and, without the use of a servo control system, the gradients can be adjusted and maintained to less than 1/10 deg C/cm and ¼ deg C in 10 cm. A changed gradient can be established in 5 minutes. In heating from cold a steady temperature is attained in 75 minutes, and the furnace can be cooled in a few minutes. This performance is achieved by minimizing the total mass of heated material, and by the use of highly reflecting water-cooled silvered surfaces for the walls. An outline is given of the regulating system for controlling the absolute temperature to 0.1 deg C. Evaporation of the alloy heater element limits the maximum temperature to about 940° C, but this should be raised by the use of other elements.
Published Version
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