Abstract
A new high pressure apparatus equipped with a beryllium pressure cell for X-ray diffraction experiments up to 5 kbar is described. The apparatus is especially designed for studying phase transitions in crystalline solids. The pressure generator has the capabilities of controlling pressure with precision of ± 2 bars and of performing a quick change in pressure applied to a sample. The beryllium miniature cell is press-fitted with a supporting jacket which has a large aperture for X-ray beams; therefore, a greater portion in reciprocal space can be surveyed. By using synchrotron radiation X-rays, we have carried out a test experiment on the incommensurate-commensurate phase transition in [N(CH 3) 4] 2MnCl 4.
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