Thermal expansion of coesite determined by synchrotron powder X-ray diffraction

Kulik, Eleonora; Murzin, Vadim; Kawaguchi, Shogo; Nishiyama, Norimasa; Katsura, Tomoo

doi:10.1007/s00269-018-0969-7

Cited by 9 publications

(7 citation statements)

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“…Then we compared our results of eclogite with the ambient upper mantle model rock pyrolite. The thermoelastic parameters for the relevant mineral phases are listed in Table S5 (Arimoto et al, ; Chen et al, ; Fei, ; Gwanmesia et al, ; Irifune et al, ; Kulik et al, ; Li & Neuville, ; Liu et al, ; Reichmann et al, ; Sang & Bass, ; Sinogeikin & Bass, ; Suzuki & Anderson, ; Yang & Wu, ; J. S. Zhang et al, ; J. S. Zhang & Bass, ).…”

Section: Resultsmentioning

confidence: 99%

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

et al. 2019

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Omphacite is a major mineral phase of eclogite, which provides the main driving force for the slab subduction into the Earth's interior. We have measured the single‐crystal elastic moduli of omphacite at high pressures for the first time up to 18 GPa at ambient temperature using Brillouin spectroscopy. A least squares fit of the velocity‐pressure data to the third‐order finite strain equation of state yields KS0′ = 4.5 (3), G0′ = 1.6 (1) with ρ0 = 3.34 (1) g/cm3, KS0 = 123 (3) GPa, and G0 = 74 (2) GPa. In addition, the synchrotron single‐crystal X‐ray diffraction data have been collected up to 18 GPa and 700 K. The fitting to Holland‐Powell thermal‐pressure equation of state yields KT0′ = 4.6 (5) and α0 = 2.7 (8) × 10−5 K−1. Based on the obtained thermoelastic parameters of omphacite, the anisotropic seismic velocities of eclogite are modeled and compared with pyrolite between 200 and 500 km. The largest contrast between the eclogite and pyrolite in terms of seismic properties is observed between ~310 and 410 km.

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Section: Resultsmentioning

confidence: 99%

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

et al. 2019

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“…Based on our variable- T XRD experiments (Figure S6), we derive the lattice parameters as a function of temperature for micron-WB 2+ x , as plotted in Figure b,c. No phase transition is observed till 773 K, followed by a quick reduction of lattice parameters, implying a decomposition, which eventually leads to the formation of W above 1173 K. Using the V – T data below 573 K, more reliable thermal expansion coefficients can be obtained by a fit of the following equation, given by V ( T ) = V 0 exp [ ∫ 0 T α false( T false) d T ] where V 0 is the volume at 0 K and α( T ) is the thermal expansion coefficient, taking the Fourier expansion form α ( T ) = α 0 + α 1 T + α 2 T − 2 …”

Section: Resultsmentioning

confidence: 99%

Synthesis, Phase Evolutions, and Stabilities of Boron-Rich Tungsten Borides at High Pressure

Zhou

et al. 2022

Inorg. Chem.

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Boron-rich tungsten borides such as WB2+x and WB3+x have been highly expected to be superhard with many advantages over conventional superhard materials. However, because the formation of boron-rich tungsten borides is thermodynamically unfavorable at ambient pressure, their crystal structures, compositions, and properties are largely unexplored, which have impeded the rational design of functional materials in the W–B family. In this work, using unique high-pressure reactions, we report a systematic synthesis study of challenging compounds of tungsten borides including WB, WB2+x , and WB3+x . The use of pressure, combined with the controllable temperature, heating duration, and ratios of starting reactants, leads to different compositions and structures of final products with largely tunable crystallite size from nanocrystalline to single-crystal forms. In addition, the optimal conditions for the formation of WB3+x are well investigated by tuning the temperature and starting ratio of reactants, as well as by adding a solvent material. Phase diagrams and stabilities of the involved W–B compounds are also well depicted, which would provide an important guidance for future exploratory synthesis and study of the family of transition-metal borides.

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“…We used a Cr‐doped MgO octahedron with an edge length of 18 mm as a pressure‐transmitting medium. Details of the high‐pressure cell assembly were described elsewhere . In order to remove absorbed moisture, the whole cell assembly and the starting glass were dried in an oil‐free vacuum oven at 8 hPa and 150°C for more than 2 hours before high‐pressure and ‐temperature (high‐ PT ) treatment.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…During the high‐ PT treatment, pressure was applied first, and then temperature was gradually increased to the target value. Generated pressure and temperature were estimated using calibrated load‐pressure and power‐temperature relations . After maintaining high‐ PT conditions (8 GPa and 1600°C) for 1 hour the sample was quenched and decompressed over 12 hours.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Hardness of polycrystalline SiO₂ coesite

et al. 2018

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We measured elastic moduli and hardness of polycrystalline SiO 2 coesite. Translucent polycrystalline bulk coesite with a grain size of about 10 micrometers was fabricated at 8 GPa and 1600°C using a Kawai-type multianvil apparatus.The obtained bulk and shear moduli are 94(1) and 60.2(3) GPa, respectively. The resulting Vickers and Knoop hardness values are 10.9(7) and 9.6(4) GPa, respectively, at an indentation load of 4.9 N. Coesite is as hard as other fourfold coordinated silica materials such as quartz and densified silica glasses. The hardness values of coesite and the fourfold coordinated silica materials are about one-third of those of sixfold coordinated silica materials, stishovite, and seifertite, which are the hardest known oxides.

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Thermal expansion of coesite determined by synchrotron powder X-ray diffraction

Cited by 9 publications

References 25 publications

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

Synthesis, Phase Evolutions, and Stabilities of Boron-Rich Tungsten Borides at High Pressure

Hardness of polycrystalline SiO₂ coesite

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Thermal expansion of coesite determined by synchrotron powder X-ray diffraction

Cited by 9 publications

References 25 publications

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

High‐Pressure Single‐Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

Synthesis, Phase Evolutions, and Stabilities of Boron-Rich Tungsten Borides at High Pressure

Hardness of polycrystalline SiO2 coesite

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Hardness of polycrystalline SiO₂ coesite