A simple and reliable technique for measuring the compressibility of solids at hydrostatic pressures of up to 9 GPa and at temperatures of up to 4500C using resistive strain gauges has been developed. A model of the strain gauge operation in a plastic regime is proposed. This model allows the determination of the change in the linear dimensions of compressed single-phase samples with the same accuracy as that ensured by the X-ray diffraction method. An important advantage of the strain gauge technique is that it ensures the same measurement accuracy for multiple-phase and noncrystalline samples, such as glasses and powder compacts, to which diffraction methods are inapplicable. The efficiency of this technique is demonstrated in a study of the transition of amorphous SiO{sub}2 to a high-density state.
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