In-situ x-ray study of the thermal expansion of iron at multimegabar pressure

Dubrovinsky, Leonid; Saxena, Surendra K.; Tutti, Faramarz; Rekhi, Sandeep; Bihan, T. Le

doi:10.1068/htrt186

Cited by 51 publications

(80 citation statements)

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“…For higher temperatures, a small heater very close to diamond anvils may be used for temperatures up to 1200K [116,117]. With a graphite heater around diamond culets, temperatures as high as 1700K have been reported [118]. However, there is an intrinsic temperature limit, due to the rapid graphitization of diamond above 1900K, even in an inert environment or vacuum [119].…”

Section: External Resistive Heatingmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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Pressure profoundly alters all states of matter. The symbiotic development of ultrahighpressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.

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Section: External Resistive Heatingmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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“…The high-temperature data are fitted to several high-temperature EOSs to extract a thermal expansivity of e-Fe. The resultant EOS parameters are compared to those obtained by Funamori et al [1996] and Dubrovinsky et al [1998aDubrovinsky et al [ , 2000. The accuracy of our new data allows us to examine structural distortion (represented by the c/a ratio), as a function of P and T. The density of e-Fe is then calculated from the EOS of pure e-Fe at the Earth's core conditions.…”

Section: And Anderson and Isaak [2000])mentioning

confidence: 99%

“…Room temperature EOS of e phase has been studied in the DAC by Mao and Bell [1979],Mao et al [1990], and Jephcoat et al [1986] up to 94, 300, and 78 GPa, respectively. The hightemperature EOS was studied by Dubrovinsky et al [1998aDubrovinsky et al [ , 2000 up to 68 GPa with a wire-heating technique in the DAC [Dubrovinsky et al, 1998a] and to 300 GPa with externally heated DAC . The laser-heated diamond anvil cell (LHDAC) covers a wide pressure and temperature range and can produce P-T conditions corresponding to the center of the Earth.…”

Section: Introductionmentioning

confidence: 99%

Stability field and thermal equation of state of ε‐iron determined by synchrotron X‐ray diffraction in a multianvil apparatus

Uchida¹,

Wang²,

Rivers³

et al. 2001

J. Geophys. Res.

109

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“…We can use argon to moderate pressures and then switch to solid pressure medium such as MgO, checking carefully that no reaction takes place during prolonged heating. In a recent study (Dubrovinsky et al, 2000), we determined the HCP to ß-phase transformation between pressures of 135 and 300 GPa. At a pressure of 301 (20) GPa, HCP iron was transformed to ß-phase at a temperature of 1350 K; the transition was reversed on cooling below 1250 K, which indicates that transition boundary has a very small negative slope in the pressuretemperature field.…”

Section: The ß-Hcp Phase Boundarymentioning

confidence: 99%