A HIGH-TEMPERATURE, HIGH-PRESSURE-CELL FOR TIME-OF-FLIGHT NEUTRON-SCATTERING

A high temperature, high pressure cell for neutron scattering studies and capable of achieving 1100 K and 1.2 GPa is described. This cell is a modification of the McWhan clamped cell design (D.B. McWhan et al., Rev. Sci. Instr. 45 (1974) 643), adapted to incorporate a graphite he ating element and optimised for time-of-flight (fixed geometry) neutro n scattering techniques. Preliminary measurements are shown using stan dard samples for calibration as well as a profile refinement of data f rom an alpha-PbF2 sample within the cell at ambient temperature and pr essure to confirm the effectiveness of cell absorption corrections, Th is refinement produced reliable structural parameters which were consi stent with those obtained under optimal conditions, A further measurem ent from a high pressure high temperature disordered phase of CuCl wit h clear diffuse scattering is also shown.