Cells for obtaining X-ray diffraction patterns from flat powder mounts in contact with liquid at elevated temperature and pressure are feasible in several designs using Poulterand armored O-ring seals and windows of boron carbide or vitreous carbon. Sintered windows of diamond or cubic boron nitride, if available, would be stronger and more nearly inert chemically, but would result in higher X-ray absorption losses.

None of the designs presented is optimum for the full range of conditions considered, to 600°C and 8 kbar. The variety of materials currently available for critical cell elements permits choices to be made for particular applications.

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