Behaviors of a Bridgiman-anvil Apparatus with a Dual-structured Gasket Up to 16 GPa

概要

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By using a dual-structured gasket composed of a half-sintered MgO-core disk and a pyrophyllite-mantle disk, very high pressures up to 16 GPa could be generated in a Bridgman-anvil apparatus at room temperature. The most optimal dimensions of the gasket were tentatively determined as 8 mm-outer, 2.5 mm-inner diameters and 3.5 mm-thick for the MgO-core disk, and 28 mm-outer, 8 mm-inner diameters and the same thickness as the above for the pyrophyllite-mantle disk, respectively. The sample space in the gasket was net about 6mm^3, with its heater space excluded. The dually composite gasket is very useful for studies of sluggish phase transformations or chemical reactions at high pressures and high temperatures. The transformation from α-quartz into stishovite at 13 GPa was completed at 1,100℃ for an hour and 600℃ for eight hours, respectively. In reference to the published data of the above phase transformation by others, lowering of the pressure generation at high temperatures was estimated as 3.25 GPa at the pressure ranges above 10 GPa. Effects of temperature on it were constant and negligible within the temperature ranges under consideration. Behaviors of the compressible gasket were studied experimentally and theoretically.
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