A HIGH-TEMPERATURE ENVIRONMENTAL CHAMBER FOR NUCLEAR-RESONANT BRAGG SCATTERING STUDIES

A compact environmental chamber with a furnace operating in the range from room temperature to about 900 K has been built for a high-tempera ture nuclear-resonant Bragg scattering study. The compact size (75 mm diameter and 70 mm depth) allows an external magnetic held to be appli ed from outside permanent Nd-Fe-B alloy magnets; a magnetic held up to 1000 G has been obtained. The chamber can be mounted on a precise the ta-2 theta goniometer so that in situ observations of X-ray diffractio n from a single crystal can be carried out. The temperature is measure d by two thermocouples placed at the top and back of the sample and co ntrolled by a PID controller. The temperature fluctuation of the chamb er is less than +/-1 K.