AN EFFICIENT AND CONVENIENT METHOD FOR RECORDING LOW TEMPERATURE X-RAY DIFFRACTION PHOTOGRAPH. S. A. Chawdhury, Suvechcha 130/2, East Subidbazar, Sylhet 3100, Bangladesh

An experimental technique has been developed for taking x-ray diffraction photograph within the range of gaseous nitrogen temperature. This technique has not only made possible the study of single crystals of interesting substances which are liquids or gases at room temperature and the phase change of certain compounds but also made possible a convenient means of increasing the quantity and improving the quality of intensity data. A metal dewar of special design, the outer tube of which is of stainless steel and the inner tube is of German silver, was constructed. It was then fitted to the specially constructed liquid nitrogen container and connected to the goniometer. A steady temperature anywhere from room temperature down to -185deg.C or so can be obtained.