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- W23417863 abstract "The laser-heated diamond anvil cell (LHDAC) technique is a uniquely powerful method for generating the ultrahigh static pressures and temperatures (P > 100 GPa and T > 3000 K) found deep within planetary interiors. Here we show that the LHDAC technique can be used in conjunction with nuclear resonant inelastic X-ray scattering and synchrotron Mossbauer spectroscopy for studying magnetic, elastic, thermodynamic, and vibrational properties of57Fe-containing materials under high pressures and temperatures. A Nd:YLF laser, operating in continuous donut mode (TEM01), has been used to heat a sample of57Fe-enriched hematite (Fe2O3) and iron from both sides of a diamond cell. Temperatures of the laser-heated sample are measured by means of spectroradiometry and the detailed balance principle of the energy spectra. The detailed balance principle applied to the inelastic X-ray scattering spectra provides absolute temperatures of the laser-heated sample. When the sample was heated evenly on both sides, these temperatures were in very good agreement with values determined from the thermal radiation spectra fitted to the Planck radiation function. Synchrotron Mossbauer spectra and partial phonon density of states (PDOS) of Fe2O3 have been obtained with these techniques up to 24 GPa and 1400 K, providing rich information for understanding physical properties of the sample under high pressures and temperatures. Time spectra of the synchrotron Mossbauer spectroscopy at 10 and 24 GPa upon laser heating reveal that Fe2O3 undergoes a magnetic-to-nonmagnetic transition at 900 (±100) K and 1000 (±100) K, respectively, from a room-temperature magnetic state to a high-temperature nonmagnetic state. The PDOS of Fe2O3 are shifted to lower energies at 1400 K, indicating the softening of the lattice vibrations at high temperatures. This study demonstrates a new arsenal of in situ probes to study magnetic, vibrational, elastic, and thermodynamic properties of 57Fe-containing materials, such as metallic Fe, Fe alloys, and iron-bearing oxides and silicates [(Mg, Fe)O and (Mg, Fe)SiO3], in the Earth's interior." @default.
- W23417863 created "2016-06-24" @default.
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- W23417863 date "2005-01-01" @default.
- W23417863 modified "2023-09-26" @default.
- W23417863 title "Nuclear resonant inelastic X-ray scattering and synchrotron Mössbauer spectroscopy with laser-heated diamond anvil cells" @default.
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- W23417863 doi "https://doi.org/10.1016/b978-044451979-5.50021-1" @default.
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