Location
University of Nevada Las Vegas, Science and Education Building
Start Date
9-8-2011 10:15 AM
End Date
9-8-2011 12:00 PM
Description
In Diamond Anvil Cells (DACs), usually a pressure transmitting medium functions to transform the uniaxial pressure supplied by the opposing diamond anvils into uniform hydrostatic pressure acting on the sample. Conventionally, a 4-1 methanol-ethanol solution, or a 16-3-1 methanol-ethanol-water solution is used as pressure transmitting medium. However, these two solutions transform into a glass with high elastic shear strength at pressures around 12-14 GPa and no longer function as hydrostatic medium. Our goal was to determine if liquid ionic alkalihalide alkanolate complexes will provide more uniform pressure in the cell up to 20 GPa. Ruby (Cr-doped AlP,) produces two Cr"+ fluorescence lines when exposed to sufficiently energetic radiation(457.9 nm in our case). These two fluorescence lines shift toward the IR with increasing pressure. We used the splitting of the two fluorescence lines as well as the width of the peaks in order to measure the shear strength of the alkalihalide alkanolate as a function of pressure.
Keywords
High pressure (Science); High Pressure (Technology)
Disciplines
Engineering Physics | Other Physics | Physics
Language
English
Ionic alkalihalides as pressure media in DAC experiments
University of Nevada Las Vegas, Science and Education Building
In Diamond Anvil Cells (DACs), usually a pressure transmitting medium functions to transform the uniaxial pressure supplied by the opposing diamond anvils into uniform hydrostatic pressure acting on the sample. Conventionally, a 4-1 methanol-ethanol solution, or a 16-3-1 methanol-ethanol-water solution is used as pressure transmitting medium. However, these two solutions transform into a glass with high elastic shear strength at pressures around 12-14 GPa and no longer function as hydrostatic medium. Our goal was to determine if liquid ionic alkalihalide alkanolate complexes will provide more uniform pressure in the cell up to 20 GPa. Ruby (Cr-doped AlP,) produces two Cr"+ fluorescence lines when exposed to sufficiently energetic radiation(457.9 nm in our case). These two fluorescence lines shift toward the IR with increasing pressure. We used the splitting of the two fluorescence lines as well as the width of the peaks in order to measure the shear strength of the alkalihalide alkanolate as a function of pressure.
Comments
Advisers: Oliver Tschauner and Valentin Iota, University of Nevada, Las Vegas
Research sponsored by: NSF grant # DMR 1005247