CONSTRUCTION OF SAMPLE HOLDER FOR X-RAY-DIFFRACTION EXPERIMENTS ON SUPERCRITICAL FLUIDS

A sample holder for X-ray diffraction experiments on supercritical flu ids has been constructed. The holder with Be windows of 2 mm thickness has endured the inner sample pressure of up to 10 MPa, and the temper ature of the sample has been changed in the range of 0-60-degrees-C. P reliminary diffraction experiments for a supercritical CO2 fluid and a high-pressured CO2 liquid near the critical point have been carried o ut using the sample holder and a detector with an imaging plate. The t otal accumulation time was about 1 h. Use of the present equipment ena bles X-ray diffraction experiments on supercritical fluids to be carri ed out very easily.