AN X-RAY TRANSMISSION DIFFRACTOMETER WITH A HIGH TEMPERATURE CAMERA FOR STUDY OF LIQUIDS

A horizontal diffractometer has been set up for transmission studies of liquid samples. An asymmetric, singly-bent LiF monochromator in the primary x-ray beam focuses the radiation on the receiving slit of the diffractometer. The sample rotates at half the angular speed of that of the x-ray detector to retain focusing at all angles of diffraction. A high temperature furnace assembly (camera) has been constructed which fits on the diffractometer. Its heating element consists of a thin-walled, pyrolitic graphite tube 38 mm in diam. A special sample holderfor the liquids is mounted on a boron nitride stool bolted to the bottom plate of the camera. Correction procecures to obtain the scattered intensity per atom from the raw data are discussed, and a comparison is made between the transmission and reflection methods with liquid tin.