A sample holder for small-angle x-ray scattering (SAXS) experiments was designed for a volume-variable operation by using a metal bellows. The key point of our design is such that no backup pressure is required. This made the sample cell and peripherals compact so that it can be placed in a limited space typical of synchrotron radiation facilities. Furthermore, the pressure/volume of the sample can be set at any desired value easily. This holder enabled us to carry out precise measurements of SAXS intensities of supercritical solutions with simple operations at many different densities. For performance test, correlation lengths, which provide information on spatial fluctuation of fluid, were evaluated for a supercritical CHF3CO2 mixture at the 0.005 mole fraction of CHF3 over a wide-density region.

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