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Title: AC calorimetry of H 2O at pressures up to 9 GPa in diamond anvil cells

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 24; Related Information: CHORUS Timestamp: 2018-02-14 12:00:48; Journal ID: ISSN 0021-8979
American Institute of Physics (AIP)
Country of Publication:
United States

Citation Formats

Geballe, Zachary M., and Struzhkin, Viktor V. AC calorimetry of H2O at pressures up to 9 GPa in diamond anvil cells. United States: N. p., 2017. Web. doi:10.1063/1.4989849.
Geballe, Zachary M., & Struzhkin, Viktor V. AC calorimetry of H2O at pressures up to 9 GPa in diamond anvil cells. United States. doi:10.1063/1.4989849.
Geballe, Zachary M., and Struzhkin, Viktor V. Wed . "AC calorimetry of H2O at pressures up to 9 GPa in diamond anvil cells". United States. doi:10.1063/1.4989849.
title = {AC calorimetry of H2O at pressures up to 9 GPa in diamond anvil cells},
author = {Geballe, Zachary M. and Struzhkin, Viktor V.},
abstractNote = {},
doi = {10.1063/1.4989849},
journal = {Journal of Applied Physics},
number = 24,
volume = 121,
place = {United States},
year = {Wed Jun 28 00:00:00 EDT 2017},
month = {Wed Jun 28 00:00:00 EDT 2017}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 28, 2018
Publisher's Accepted Manuscript

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  • We report the first application of a multichannel collimator (MCC) to perform quantitative structure factor measurements of dense low-Z fluids in a diamond anvil cell (DAC) using synchrotron x-ray diffraction. The MCC design, initially developed for the Paris-Edinburgh large volume press geometry, has been modified for use with diamond anvil cells. A good selectivity of the diffracted signal of the dense fluid sample is obtained due to a large rejection of the Compton diffusion from the diamond anvils. The signal to background ratio is significantly improved. We modify previously developed analytical techniques for quantitative measurement of the structure factor ofmore » fluids in DACs [J. H. Eggert, G. Weck, P. Loubeyre, and M. Mezouar, Phys. Rev. B 65, 174105 (2002)] to account for the contribution of the MCC. We present experimental results on liquids argon and hydrogen at 296 K to validate our method and test its limits, respectively.« less
  • We report {sup 63}Cu nuclear quadrupole resonance (NQR) measurement of Cu{sub 2}O under pressure up to about 10 GPa at low temperatures. Because the lattice parameter of Cu{sub 2}O changes with increasing pressure, the electric field gradient at the Cu site also changes correspondingly with pressure. This enables us to use the Cu{sub 2}O as an in situ manometer for high pressure nuclear magnetic resonance/NQR up to about 9 GPa.
  • We present an optical pressure sensor suitable for experiments in diamond anvil cell in the 0.1 MPa-2 GPa pressure range, for temperatures between ambient and 323 K. It is based on the pressure-dependent fluorescence spectrum of FluoSpheres[reg], which are commercially available fluorescent microspheres commonly used to measure blood flow in experimental biology. The fluorescence of microspheres is excited by the 514.5 nm line of an Ar{sup +} laser, and the resulting spectrum displays three very intense broad bands at 534, 558, and 598 nm, respectively. The reference wavelength and pressure gauge is that of the first inflection point of themore » spectrum, located at 525.6{+-}0.2 nm at ambient pressure. It is characterized by an instantaneous and large linear pressure shift of 9.93({+-}0.08) nm/GPa. The fluorescence of the FluoSpheres[reg] has been investigated as a function of pressure (0.1-4 GPa), temperature (295-343 K), pH (3-12), salinity, and pressure transmitting medium. These measurements show that, for pressures comprised between 0.1 MPa and 2 GPa, at temperatures not exceeding 323 K, at any pH, in aqueous pressure transmitting media, pressure can be calculated from the wavelength shift of two to three beads, according to the relation P=0.100 ({+-}0.001) {delta}{lambda}{sub i}(P) with {delta}{lambda}{sub i}(P)={lambda}{sub i}(P)-{lambda}{sub i}(0) and {lambda}{sub i}(P) as the wavelength of the first inflection point of the spectrum at the pressure P. This pressure sensor is approximately thirty times more sensitive than the ruby scale and responds instantaneously to pressure variations.« less