A High Temperature X-Ray Diffraction Camera

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Abstract
A high temperature x‐ray powder diffraction camera has been designed to yield patterns at temperatures in excess of 2500°K. The sample, in form of a wire, compacted rod, or contained (wherever suitable) in a thin walled quartz or ceramic tube, is heated indirectly by conduction and radiation in a thin walled molybdenum, tantalum, or platinum furnace. The furnace is heated by high frequency (0.5 megacycles) eddy currents induced by a small induction coil. The cylindrically shaped furnace and the sample are held coaxially in the induction coil and slowly revolved. The specimen temperature is maintained constant to ±0.2 percent by an especially designed temperature regulator. A water‐cooled copper jacket with slots covered with metal foil to filter the diffracted x‐radiation surrounds the furnace and is used to protect the x‐ray film from heat and light. The temperature of the specimen is measured with a disappearing filament optical pyrometer at temperatures in excess of 1100°K and a platinum, platinum‐rhodium thermocouple at lower temperatures. The camera is either operated with a high vacuum or with an inert gas atmosphere.

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