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dc.contributor.authorBalzaretti, Naira Mariapt_BR
dc.contributor.authorGonzalez, E.J.pt_BR
dc.contributor.authorPiermarini, Gasper J.pt_BR
dc.contributor.authorRussell, T.P.pt_BR
dc.date.accessioned2020-01-23T04:04:45Zpt_BR
dc.date.issued1999pt_BR
dc.identifier.issn0034-6748pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/204822pt_BR
dc.description.abstractResistance heating of the gasket strip in a gem-anvil high pressure cell was successful in obtaining sample temperatures up to 1100 °C, under pressures up to 4.0 GPa. The heating capabilities, as well as the mechanical and chemical stability, of several different gasket strips ~two Ni-based alloys, Ta, Pt/Rh, and a Re/Mo alloy! with different design shapes, and two different single-crystal anvil materials ~diamond and cubic zirconia! were investigated. Two gasket-strip designs were found to provide optimum uniform heating conditions while decreasing the required current needed to achieve 1100 °C. Two anvil systems were investigated to reduce the temperature increase of the pressure cell body. Cubic zirconia anvils reduced the cell-body temperature to 100 °C at sample temperatures up to 1100 °C. However, zirconia anvils often failed during heating and almost always failed during cooling. Diamond anvils with cubic zirconia mounting plates also permitted temperatures up to 1100 °C to be reached without anvil failure. However, the cell-body temperature increased to 300 °C. A sealed vacuum-type chamber was employed to eliminate the problem with gasket and anvil oxidation. The optimized operating parameters reported here provide a routine method for high temperature-high pressure studies. The method was used to densify and sinter nanosize amorphous silicon nitride and g-alumina powders at high temperatures and high pressures.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofReview of Scientific Instruments. Woodbury. Vol. 70, no. 11 (Nov. 1999), p. 4316-4323pt_BR
dc.rightsOpen Accessen
dc.subjectDiamantept_BR
dc.subjectZircôniapt_BR
dc.subjectAltas temperaturaspt_BR
dc.subjectAltas pressõespt_BR
dc.subjectInstrumentaçãopt_BR
dc.titleResistance heating of the gasket in a gem-anvil high pressure cellpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000055635pt_BR
dc.type.originEstrangeiropt_BR


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