Calibration of the ruby pressure gauge to 800 kbar under quasi‐hydrostatic conditions

Mao, Ho‐kwang; Xu, Jian; Bell, Peter M.

doi:10.1029/jb091ib05p04673

Cited by 4,060 publications

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“…Anvils having a 600 µm flat culet were used. Pressure was determined by the ruby-fluorescence method with the quasihydrostatic scale 38 . Three independent runs were conducted, with a helium pressure medium in runs 1 and 2, and with a 4:1 mixture of methanol-ethanol medium in run 3 for comparison.…”

Section: Methodsmentioning

confidence: 99%

Helium penetrates into silica glass and reduces its compressibility

2011

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SiO 2 glass has a network structure with a significant amount of interstitial voids. Gas solubilities in silicates are expected to become small under high pressure due to compaction of voids. Here we show anomalous behaviour of SiO 2 glass in helium. Volume measurements clarify that SiO 2 glass is much less compressible than normal when compressed in helium, and the volume in helium at 10 GPa is close to the normal volume at 2 GPa. X-ray diffraction and Raman scattering measurements suggest that voids are prevented from contracting when compressed in helium because helium penetrates into them. The estimated helium solubility is very high and is between 1.0 and 2.3 mol per mole of SiO 2 glass at 10 GPa, which shows marked contrast with previous models. These results may have implications for discussions of the Earth's evolution as well as interpretations of various high-pressure experiments, and also lead to the creation of new materials.

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Section: Methodsmentioning

confidence: 99%

Helium penetrates into silica glass and reduces its compressibility

2011

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“…Mg−C mixtures were pressed into ∼20 × 10 μm 2 discs and loaded into the sample chamber, along with a ruby sphere for pressure calibration. 26 Neon was used as a pressure transmitting medium and also served as thermal insulation between the sample and diamonds during heating. Samples were compressed to pressures ranging ∼10−30 GPa and heated between ∼1500 and 2000 K using the infrared laser heating (LH) system at HPCAT, sector 16, Advanced Photon Source.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of β-Mg₂C₃: A Monoclinic High-Pressure Polymorph of Magnesium Sesquicarbide

et al. 2014

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A new monoclinic variation of Mg 2 C 3 was synthesized from the elements under high-pressure (HP), high-temperature (HT) conditions. Formation of the new compound, which can be recovered to ambient conditions, was observed in situ using X-ray diffraction with synchrotron radiation. The structural solution was achieved by utilizing accurate theoretical results obtained from ab initio evolutionary structure prediction algorithm USPEX. Like the previously known orthorhombic Pnnm structure (α-Mg 2 C 3 ), the new monoclinic C2/m structure (β-Mg 2 C 3 ) contains linear C 3 4− chains that are isoelectronic with CO 2 . Unlike α-Mg 2 C 3 , which contains alternating layers of C 3 4− chains oriented in opposite directions, all C 3 4− chains within β-Mg 2 C 3 are nearly aligned along the crystallographic c-axis. Hydrolysis of β-Mg 2 C 3 yields C 3 H 4 , as detected by mass spectrometry, while Raman and NMR measurements show clear CC stretching near 1200 cm −1 and 13 C resonances confirming the presence of the rare allylenide anion.

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“…The material was loaded together with a small ruby-sphere, and sample pressures were determined from the pressure dependent shift of the ruby fluorescence R 1 line [12]. The pressure-induced frequency shifts were monitored while the sample was compressed and decompressed in the same way as the previous experiment.…”

Section: Experimental Methodsmentioning

confidence: 99%

Stiffening of nanoscale anatase Ti0.9Zr0.1O2 upon multiple compression cycles

Holbig¹,

Dubrovinsky²,

Miyajima³

et al. 2008

Journal of Physics and Chemistry of Solids

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The compression behavior of nanoscale Zr-doped anatase was studied by means of a diamond anvil cell experiment with alternating cycles of compression and decompression in the stability field of anatase (up to 13 GPa). We found that multiple cycles of compression lead to stiffening of the material: Precompressed samples of nanoanatase Ti 0.9 Zr 0.1 O 2 have a higher bulk modulus (K 0 = 249(9) and 266(6) GPa) compared to the sample when compressed for the first time (K 0 = 211(7) GPa). Upon compression, the crystallite size remains the same and the crystalline areas are free of defects. After the experiment, the crystallites are surrounded by amorphous rims, confirming the theoretical prediction by Pischedda et al.[1] for nanoscale anatase, but yielding much lower pressures (12 GPa) for the onset of partial amorphization.

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Calibration of the ruby pressure gauge to 800 kbar under quasi‐hydrostatic conditions

Cited by 4,060 publications

References 4 publications

Helium penetrates into silica glass and reduces its compressibility

Helium penetrates into silica glass and reduces its compressibility

Synthesis of β-Mg₂C₃: A Monoclinic High-Pressure Polymorph of Magnesium Sesquicarbide

Stiffening of nanoscale anatase Ti0.9Zr0.1O2 upon multiple compression cycles

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Calibration of the ruby pressure gauge to 800 kbar under quasi‐hydrostatic conditions

Cited by 4,060 publications

References 4 publications

Helium penetrates into silica glass and reduces its compressibility

Helium penetrates into silica glass and reduces its compressibility

Synthesis of β-Mg2C3: A Monoclinic High-Pressure Polymorph of Magnesium Sesquicarbide

Stiffening of nanoscale anatase Ti0.9Zr0.1O2 upon multiple compression cycles

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Synthesis of β-Mg₂C₃: A Monoclinic High-Pressure Polymorph of Magnesium Sesquicarbide