An X-Ray High Temperature Camera

A powder camera is described which was designed for the purpose of taking x-ray photographs through an x-ray diffraction angle of 0°—45° in a cylindrical camera of 57.3-mm radius, to temperatures greater than 300°C. The essential features are (1) a concentric heater extending above and below the sample to minimize sharp temperature gradients; (2) easy access to the oven coils if adjustment is necessary; (3) an iron-constantan thermocouple of small dimensions which allows one to take temperatures close to the sample; (4) a water-cooled jacket surrounding the oven to avoid heating the film. Rotation of the sample at 1 r.p.m. is provided for. Calibration of the thermocouple and the type of capillaries are described for high temperatures.