The melting of jadeite to 60 kilobars

Williams, D. W.; Kennedy, George C.

doi:10.2475/ajs.269.5.481

Cited by 12 publications

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“…Significant changes in crystal structure are required, however. Comparisons between different sources [e.g., Holland , 1980; Morse , 1980; Williams and Kennedy , 1970] reveal some uncertainty in the details of the phase diagram near these mineral phase transitions at high pressures. Here, we assume that θ w is sufficiently short that albite does not in fact change phase.…”

Section: Physical Parametersmentioning

confidence: 99%

A model for flash weakening by asperity melting during high‐speed earthquake slip

Rempel

Weaver

2008

J. Geophys. Res.

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[1] Recent results from laboratory experiments on a broad range of mineral systems exhibit dramatic drops in the effective friction coefficient m once the slip rate exceeds a critical level V w , which is typically O(0.1) m/s. This ''flash weakening'' has been attributed to the effects of localized heating at highly stressed microscopic asperities. We extend previous phenomenological treatments to assess whether melting at asperity contacts can explain the observed changes in strength. Using physical parameters obtained from the literature on the phase behavior and mechanical properties of quartz, albite, dolomite, gabbro, Westerly granite, and serpentinite, the predictions of our simplified model are in reasonable agreement with available experimental data. We derive approximate analytical expressions that suggest that strength changes are insensitive to the melt viscosity under conditions that likely include those during earthquake slip along major fault systems. Instead, the primary controls on m are the ratio of slip rate V to V w and the Stefan number S, which is defined as the ratio of the latent heat of fusion to the sensible heat required to raise the temperature from ambient levels. The phase behavior during the short lifetimes and at the high confining pressures of asperity contacts is a significant source of uncertainty in the parameter choices, as are the presence and availability of water. Nevertheless, our results are encouraging for further efforts to incorporate the microphysics of fault zone processes into earthquake simulations.Citation: Rempel, A. W., and S. L. Weaver (2008), A model for flash weakening by asperity melting during high-speed earthquake slip,

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Section: Physical Parametersmentioning

confidence: 99%

A model for flash weakening by asperity melting during high‐speed earthquake slip

Rempel

Weaver

2008

J. Geophys. Res.

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“…In addition, several alternative routes have been constructed, such as gas absorption of metal alloys, − mechanical alloying, , anomalous diffusion, or pulsed laser irradiation, etc. Compared to these traditional methods, pressure-induced amorphization is more complex and unique and has been observed in various elements, − compounds, − and alloys. − However, almost all of these transformations are found in the compression process, so far widely unknown to the crystalline-to-amorphous transition with releasing pressure. Here, we find that a Sb-Se amorphous phase can be synthesized by pressurizing and depressurizing Sb 2 Se 3 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Structural Stability of Sb₂Se₃ via Pressure-Induced Alloying and Amorphization

Cheng

Zhang

et al. 2020

J. Phys. Chem. C

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In this work, we revealed that Sb 2 Se 3 has one second-order isostructural phase transitions before it eventually transformed into a site-disordered alloy during compression. Then, a rare amorphization of alloy was discovered with decreasing pressure in Sb 2 Se 3 by performing in situ high-pressure X-ray diffraction (XRD) and Raman experiments, which may be owed to the significant difference in atomic electronegativity of Sb 2 Se 3 . Compared to the original structure, the amorphous phase of Sb 2 Se 3 is more stable at high pressure. Surprisingly, the structural stability of amorphous Sb 2 Se 3 at varying temperatures was also significantly improved via recompression. Our findings will provide insight into the formation mechanism of the bcc alloys and amorphization in A 2 B 3 (A = Sb, Bi; B = S, Se, Te) compounds and, especially, offer a new way to prepare amorphous materials. ■ INTRODUCTIONGenerally, amorphous materials can be obtained by rapid solidification of vapors and the melts, 1−3 which have been recognized and widely employed in the field of material science. In addition, several alternative routes have been constructed, such as gas absorption of metal alloys, 4−6 mechanical alloying, 7,8 anomalous diffusion, 9 or pulsed laser irradiation, 10 etc. Compared to these traditional methods, pressure-induced amorphization is more complex and unique and has been observed in various elements, 11−15 compounds, 16−22 and alloys. 23−25 However, almost all of these transformations are found in the compression process, so far widely unknown to the crystalline-to-amorphous transition with releasing pressure. Here, we find that a Sb-Se amorphous phase can be synthesized by pressurizing and depressurizing Sb 2 Se 3 .As typical A 2 B 3 -form (A = Sb, Bi; B = S, Se, Te) compounds, Sb 2 Se 3 has attracted a lot of interest due to the interesting properties for several applications, such as thermoelectric devices, 26 solar cells, 27 optical recording material, 28 and hydrogen storage materials, 29 etc. In recent years, Bi 2 Te 3 , Sb 2 Te 3 , and Bi 2 Se 3 have been experimentally observed as the simplest 3D topological insulators, 30,31 which make A 2 B 3 became a hot topic in the field of material research. External pressure can be used to tune the electronic and atomic structures of materials. It has been verified that the thermoelectric properties of Bi 2 Te 3 , Bi 2 Se 3 , and Sb 2 Te 3 can be improved under high pressures. 32−35 Also, pressure-induced electronic topological transitions (ETTs), 36−40 superconductivity, 41−47 and metallization transitions 48−50 of these compounds have also been extensively investigated. However, compared to the sufficient high-pressure studies of rhombohedral forms of A 2 B 3 (Bi 2 Te 3 , Sb 2 Te 3 , and Bi 2 Se 3 ), 39,45,51−59 the Pnma types of A 2 B 3 (Bi 2 S 3 , Sb 2 S 3 , and Sb 2 Se 3 ) have not received similar attention because of the lack of topological properties, and their structural transformations at high pressure are still indistinct. By a combination of high-pressure X...

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Cumberland Falls chondritic inclusions—II. Trace element contents of forsterite chondrites and meteorites of similar redox state

Verkouteren

Lipschutz

1983

Geochimica et Cosmochimica Acta

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The melting of jadeite to 60 kilobars

Cited by 12 publications

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A model for flash weakening by asperity melting during high‐speed earthquake slip

A model for flash weakening by asperity melting during high‐speed earthquake slip

Enhanced Structural Stability of Sb₂Se₃ via Pressure-Induced Alloying and Amorphization

Cumberland Falls chondritic inclusions—II. Trace element contents of forsterite chondrites and meteorites of similar redox state

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The melting of jadeite to 60 kilobars

Cited by 12 publications

References 0 publications

A model for flash weakening by asperity melting during high‐speed earthquake slip

A model for flash weakening by asperity melting during high‐speed earthquake slip

Enhanced Structural Stability of Sb2Se3 via Pressure-Induced Alloying and Amorphization

Cumberland Falls chondritic inclusions—II. Trace element contents of forsterite chondrites and meteorites of similar redox state

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Enhanced Structural Stability of Sb₂Se₃ via Pressure-Induced Alloying and Amorphization