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5644253513
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note
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3 pressure media surrounding a graphite furnace were used in the piston-cylinder runs; temperature was controlled by means of a W3%Re-W25%Re thermocouple not adjusted for the effect of pressure.
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11
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0000507122
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We calibrated the pressure of multianvil runs against hydraulic pressure using the room-temperature Bi and ZnTe transitions and the 1200°C coesite-stishovite transition [T. Yagi and S.-I. Akimoto, Tectonophysics 35, 259 (1976)]. We monitored and controlled the run temperature using a W5%ReW26%Re thermocouple The axial thermocouple was within 0.5 mm of the capsule end, and we estimate that the temperature difference between thermocouple and capsule center was 50° to 75°C The capsule was separated from the Rh furnace by magnesia spacers, and the capsule-furnace assembly was encased in a zirconia sleeve and surrounded by a cast Aramco 584 MgO octahedron with integral gaskets [D. Walker, Am. Mineral. 76, 1092 (1991)] The run was pressurized over several hours, brought to run temperature, and then quenched by a reduction in furnace power; pressure was then slowly released overnight.
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Tectonophysics
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Yagi, T.1
Akimoto, S.-I.2
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12
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0026286444
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We calibrated the pressure of multianvil runs against hydraulic pressure using the room-temperature Bi and ZnTe transitions and the 1200°C coesite-stishovite transition [T. Yagi and S.-I. Akimoto, Tectonophysics 35, 259 (1976)]. We monitored and controlled the run temperature using a W5%ReW26%Re thermocouple The axial thermocouple was within 0.5 mm of the capsule end, and we estimate that the temperature difference between thermocouple and capsule center was 50° to 75°C The capsule was separated from the Rh furnace by magnesia spacers, and the capsule-furnace assembly was encased in a zirconia sleeve and surrounded by a cast Aramco 584 MgO octahedron with integral gaskets [D. Walker, Am. Mineral. 76, 1092 (1991)] The run was pressurized over several hours, brought to run temperature, and then quenched by a reduction in furnace power; pressure was then slowly released overnight.
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Walker, D.1
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The recovered capsules were mounted in epoxy, sectioned, and polished for electron microprobe analysis. The graphite capsules of the multianvil runs had for the most part converted to diamond and therefore initial sectioning was done on a diamond surface gnnder, followed by diamond lapping In the final polishing we used a colloidal silica polisher, which minimized plucking, and polished the silicate and sulfide around the protruding diamond of the capsule. We measured the distributions of apparent θ by following the procedure of E. B. Watson and J M. Brenan [Earth Planet. Sci Lett 85, 497 (1987)]
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note
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We thank M. Hirschmann for discussions that motivated the initial experiments, and G. Gwanmesia, B. Li, and R. Lieberman, who helped with preliminary multianvil work. Reviews by J. Brenan, D. Farber, and N Marchildon improved the manuscript. Supported by the Lawrence Livermore National Laboratory Institute of Geophysics and Planetary Physics (F.J.R.) under the auspices of Department of Energy contract W-7405-Eng-48 Additional support was provided by National Science Foundation grants EAR-8717341 and EAR-9105055 to E.B.W.
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