Pub Date : 2021-01-02DOI: 10.1080/08957959.2021.1891229
I. Batyrev, P. Cifligu, K. A. Pineda, S. Coleman, M. Pravica
ABSTRACT We report theoretical and experimental investigations on the structures of strontium and magnesium oxalates, and corresponding Raman spectra at high pressure. These systems have shown progress in the generation of CO2 and in the synthesis of energetic doped polymeric carbon monoxide after X-ray irradiation and simultaneous application of high pressure. Density functional perturbation theory (DFT) was used to calculate the zone center optical phonons in monoclinic and triclinic strontium oxalate, and the ambient triclinic phase of magnesium oxalate. Vibration modes were also determined in terms of atomic displacements for both compounds. The simulations were compared to experimental Raman spectra in an effort to elucidate the details of the phase transition between monoclinic and triclinic phases. Additional phonon dispersion calculations of the compounds were performed to gain better insight into the dynamic phase stability in strontium and magnesium oxalates under high pressure.
{"title":"Structure and vibration spectra of strontium and magnesium oxalates at high pressure","authors":"I. Batyrev, P. Cifligu, K. A. Pineda, S. Coleman, M. Pravica","doi":"10.1080/08957959.2021.1891229","DOIUrl":"https://doi.org/10.1080/08957959.2021.1891229","url":null,"abstract":"ABSTRACT We report theoretical and experimental investigations on the structures of strontium and magnesium oxalates, and corresponding Raman spectra at high pressure. These systems have shown progress in the generation of CO2 and in the synthesis of energetic doped polymeric carbon monoxide after X-ray irradiation and simultaneous application of high pressure. Density functional perturbation theory (DFT) was used to calculate the zone center optical phonons in monoclinic and triclinic strontium oxalate, and the ambient triclinic phase of magnesium oxalate. Vibration modes were also determined in terms of atomic displacements for both compounds. The simulations were compared to experimental Raman spectra in an effort to elucidate the details of the phase transition between monoclinic and triclinic phases. Additional phonon dispersion calculations of the compounds were performed to gain better insight into the dynamic phase stability in strontium and magnesium oxalates under high pressure.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"52 - 64"},"PeriodicalIF":2.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1891229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44817534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-02DOI: 10.1080/08957959.2020.1858821
Kaleb C. Burrage, Chia-Min Lin, Wei-Chih Chen, Cheng-Chien Chen, Y. Vohra
ABSTRACT Thermoelastic behavior of transition metal boride Os2B3 was studied under quasi-hydrostatic and isothermal conditions in a Paris-Edinburgh cell to 5.4 GPa and 1273 K. In-situ Energy Dispersive X-ray diffraction was used to determine interplanar spacings of the hexagonal crystal structure and the P-V-T data were fitted to a 3rd Order Birch–Murnaghan equation of state with a temperature modification to determine thermal elastic constants. The bulk modulus was shown to be K0 = 402 ± 21 GPa when the first pressure derivative was held to K0’ = 4.0 from the room temperature P-V curve. Under a quadratic fit , the thermal expansion coefficients were determined to be K−1, K−2, and K. Density functional theory (DFT) with the quasi-harmonic approximation (QHA) were employed to study Os2B3, including its P-V-T curves, phonon spectra, bulk modulus, specific heat, thermal expansion, and the Grüneisen parameter. A good agreement between the first-principle theory and experimental observations was achieved, highlighting the success of the Armiento-Mattsson 2005 generalized gradient approximation functional employed in this study and QHA for describing thermodynamic properties of Os2B3.
{"title":"Experimental and theoretical P-V-T equation of state for Os2B3","authors":"Kaleb C. Burrage, Chia-Min Lin, Wei-Chih Chen, Cheng-Chien Chen, Y. Vohra","doi":"10.1080/08957959.2020.1858821","DOIUrl":"https://doi.org/10.1080/08957959.2020.1858821","url":null,"abstract":"ABSTRACT Thermoelastic behavior of transition metal boride Os2B3 was studied under quasi-hydrostatic and isothermal conditions in a Paris-Edinburgh cell to 5.4 GPa and 1273 K. In-situ Energy Dispersive X-ray diffraction was used to determine interplanar spacings of the hexagonal crystal structure and the P-V-T data were fitted to a 3rd Order Birch–Murnaghan equation of state with a temperature modification to determine thermal elastic constants. The bulk modulus was shown to be K0 = 402 ± 21 GPa when the first pressure derivative was held to K0’ = 4.0 from the room temperature P-V curve. Under a quadratic fit , the thermal expansion coefficients were determined to be K−1, K−2, and K. Density functional theory (DFT) with the quasi-harmonic approximation (QHA) were employed to study Os2B3, including its P-V-T curves, phonon spectra, bulk modulus, specific heat, thermal expansion, and the Grüneisen parameter. A good agreement between the first-principle theory and experimental observations was achieved, highlighting the success of the Armiento-Mattsson 2005 generalized gradient approximation functional employed in this study and QHA for describing thermodynamic properties of Os2B3.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"27 - 38"},"PeriodicalIF":2.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1858821","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46289646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-28DOI: 10.1080/08957959.2020.1865343
A. Pommier, K. Leinenweber, H. Pirotte, T. Yu, Y. Wang
ABSTRACT We have developed a new type of experimental setup utilizing a multi-anvil large volume press and designed for simultaneous measurements of structure-sensitive thermophysical properties (diffraction, electrical resistivity, viscosity). This multi-probe capability was tested on iron alloys at 2 GPa and up to 1750 K. Phase transitions as detected by X-ray diffraction patterns are clearly associated with changes in the electrical response of the samples. In Fe-S liquids, viscosity measurements in the molten state indicate an increase in viscosity with increasing the amount of alloying agent. A correlation between electrical resistivity and viscosity from our data and previous works is observed. This multi-probe measurement capability improves the detection of solid-state transformations and solid-melt transitions, relates structural and electrical properties of geomaterials, and allows constraining the mobility of melts using viscosity data. This new setup advances research about melt distribution and mobility at conditions relevant to planetary interiors.
{"title":"In situ electrical resistivity and viscosity measurements of iron alloys under pressure using synchrotron X-ray radiography","authors":"A. Pommier, K. Leinenweber, H. Pirotte, T. Yu, Y. Wang","doi":"10.1080/08957959.2020.1865343","DOIUrl":"https://doi.org/10.1080/08957959.2020.1865343","url":null,"abstract":"ABSTRACT We have developed a new type of experimental setup utilizing a multi-anvil large volume press and designed for simultaneous measurements of structure-sensitive thermophysical properties (diffraction, electrical resistivity, viscosity). This multi-probe capability was tested on iron alloys at 2 GPa and up to 1750 K. Phase transitions as detected by X-ray diffraction patterns are clearly associated with changes in the electrical response of the samples. In Fe-S liquids, viscosity measurements in the molten state indicate an increase in viscosity with increasing the amount of alloying agent. A correlation between electrical resistivity and viscosity from our data and previous works is observed. This multi-probe measurement capability improves the detection of solid-state transformations and solid-melt transitions, relates structural and electrical properties of geomaterials, and allows constraining the mobility of melts using viscosity data. This new setup advances research about melt distribution and mobility at conditions relevant to planetary interiors.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"1 - 13"},"PeriodicalIF":2.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1865343","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42604518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-26DOI: 10.1080/08957959.2020.1863398
Wei Song, Qizhe Tang, Chang Su, Xiang Chen, Yonggang Liu
ABSTRACT Two ultrasonic measurement methods for pressure calibration to 4.4 GPa in a multi-anvil apparatus by measuring the travel times of longitudinal wave as a function of pressure are reported. The first method is to continuously calibrate pressure by combining the measured travel times of Z-cut quartz under hydrostatic pressure with the related equation of state and unit-cell parameters of quartz. The second method is fixed-point calibration, which is to calibrate the pressure by measuring the abrupt change of the longitudinal wave travel times since the samples, H2O, Hg and Bi used in this study will undergo pressure-induced phase transitions at room temperature. Experimental results of these two methods are in good agreement. The quartz pressure scale obtained from this study is expressed as P(GPa) = 28.7(1−t p/t p0). The two ultrasonic measurement methods might be complementary means for pressure calibration in situations where other probe method is not conveniently available.
{"title":"Pressure calibration based on the ultrasonic measurement in multi-anvil apparatus","authors":"Wei Song, Qizhe Tang, Chang Su, Xiang Chen, Yonggang Liu","doi":"10.1080/08957959.2020.1863398","DOIUrl":"https://doi.org/10.1080/08957959.2020.1863398","url":null,"abstract":"ABSTRACT Two ultrasonic measurement methods for pressure calibration to 4.4 GPa in a multi-anvil apparatus by measuring the travel times of longitudinal wave as a function of pressure are reported. The first method is to continuously calibrate pressure by combining the measured travel times of Z-cut quartz under hydrostatic pressure with the related equation of state and unit-cell parameters of quartz. The second method is fixed-point calibration, which is to calibrate the pressure by measuring the abrupt change of the longitudinal wave travel times since the samples, H2O, Hg and Bi used in this study will undergo pressure-induced phase transitions at room temperature. Experimental results of these two methods are in good agreement. The quartz pressure scale obtained from this study is expressed as P(GPa) = 28.7(1−t p/t p0). The two ultrasonic measurement methods might be complementary means for pressure calibration in situations where other probe method is not conveniently available.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"75 - 87"},"PeriodicalIF":2.0,"publicationDate":"2020-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1863398","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43240007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-26DOI: 10.1080/08957959.2020.1863399
Hirofumi Satani, Masahiko Kuwata, Hirotaka Ishii, Toshifumi Inoue, A. Shimizu
ABSTRACT The preparation of SEM samples is a complex and time-consuming process. The present report describes the development of a simple and inexpensive high pressure water freeze fracture method for the preparation of SEM samples from hydrogels without using organic solvents. This method involves two key features. First, the sample and water are frozen with liquid nitrogen in a pressure-resistant container, and the sample is pressurized by volume expansion due to phase transition of the water around the sample as it freezes, which suppresses the growth of ice crystals due to the increase in viscosity of the water inside and around the sample. Second, a cross-section of the sample is prepared without the use of a knife. This method is expected to contribute significantly to biological and food science research.
{"title":"Preparation of SEM hydrogel samples using a high pressure water freeze fracture method","authors":"Hirofumi Satani, Masahiko Kuwata, Hirotaka Ishii, Toshifumi Inoue, A. Shimizu","doi":"10.1080/08957959.2020.1863399","DOIUrl":"https://doi.org/10.1080/08957959.2020.1863399","url":null,"abstract":"ABSTRACT The preparation of SEM samples is a complex and time-consuming process. The present report describes the development of a simple and inexpensive high pressure water freeze fracture method for the preparation of SEM samples from hydrogels without using organic solvents. This method involves two key features. First, the sample and water are frozen with liquid nitrogen in a pressure-resistant container, and the sample is pressurized by volume expansion due to phase transition of the water around the sample as it freezes, which suppresses the growth of ice crystals due to the increase in viscosity of the water inside and around the sample. Second, a cross-section of the sample is prepared without the use of a knife. This method is expected to contribute significantly to biological and food science research.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"97 - 108"},"PeriodicalIF":2.0,"publicationDate":"2020-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1863399","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42606546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-15DOI: 10.1080/08957959.2020.1857377
R. Kitahara, H. Ueta, Uiko Tomiyasu, K. Egashira
ABSTRACT Life adapts to various environments, including high temperatures and high pressures. The brine shrimp Artemia was used to investigate the tolerance to hydrostatic pressure up to 750 bar. The swimming activity of Artemia nauplii (larval form) decreased as pressure increased, and the activity became null at 400 bar and above. Interestingly, at 300 bar and less, the swimming activity gradually recovered even under pressure within a short period of time. Up to 500 bar, the activity was reversibly recovered by reducing the pressure to 1 bar. These results could be explained by reversible responses of protein functions and membrane structures, as well as temporal adaptation of cell functions to pressure. The upper limit pressure at which the swimming activity was reversible or irreversible matched that for macromolecular synthesis (500 bar). Altogether, these results indicate that eukaryotes and prokaryotes can temporarily adapt to a high pressure of 500 bar and less.
{"title":"Pressure tolerance of brine shrimp (Artemia)","authors":"R. Kitahara, H. Ueta, Uiko Tomiyasu, K. Egashira","doi":"10.1080/08957959.2020.1857377","DOIUrl":"https://doi.org/10.1080/08957959.2020.1857377","url":null,"abstract":"ABSTRACT Life adapts to various environments, including high temperatures and high pressures. The brine shrimp Artemia was used to investigate the tolerance to hydrostatic pressure up to 750 bar. The swimming activity of Artemia nauplii (larval form) decreased as pressure increased, and the activity became null at 400 bar and above. Interestingly, at 300 bar and less, the swimming activity gradually recovered even under pressure within a short period of time. Up to 500 bar, the activity was reversibly recovered by reducing the pressure to 1 bar. These results could be explained by reversible responses of protein functions and membrane structures, as well as temporal adaptation of cell functions to pressure. The upper limit pressure at which the swimming activity was reversible or irreversible matched that for macromolecular synthesis (500 bar). Altogether, these results indicate that eukaryotes and prokaryotes can temporarily adapt to a high pressure of 500 bar and less.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"109 - 117"},"PeriodicalIF":2.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1857377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42300183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-08DOI: 10.1080/08957959.2020.1853123
C. Wilson, C. Ridley, S. Macleod, C. Bull
ABSTRACT The structural transformation of FePO from the trigonal berlinite phase to the orthorhombic CrVO phase has been studied using neutron diffraction at high pressure and high-temperature. The berlinite structure was compressed to a pressure of 5.2(2) GPa and amorphisation observed. Upon annealing at temperatures above 798(28) K the high pressure FePO structure was observed to form. This lowers the formation temperature required to promote this phase over the amorphous phase by ∼100 K compared to previous reports. No other structured phases were observed during the formation process which implies that the CrVO structure is the most stable form at high pressures and is kinetically inhibited from forming at low temperatures.
{"title":"In situ formation of FePO4-II: a neutron diffraction study","authors":"C. Wilson, C. Ridley, S. Macleod, C. Bull","doi":"10.1080/08957959.2020.1853123","DOIUrl":"https://doi.org/10.1080/08957959.2020.1853123","url":null,"abstract":"ABSTRACT The structural transformation of FePO from the trigonal berlinite phase to the orthorhombic CrVO phase has been studied using neutron diffraction at high pressure and high-temperature. The berlinite structure was compressed to a pressure of 5.2(2) GPa and amorphisation observed. Upon annealing at temperatures above 798(28) K the high pressure FePO structure was observed to form. This lowers the formation temperature required to promote this phase over the amorphous phase by ∼100 K compared to previous reports. No other structured phases were observed during the formation process which implies that the CrVO structure is the most stable form at high pressures and is kinetically inhibited from forming at low temperatures.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"14 - 26"},"PeriodicalIF":2.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1853123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46738955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-11DOI: 10.1080/08957959.2020.1841759
A. Eich, M. Hölzle, Y. Su, V. Hutanu, R. Georgii, L. Beddrich, A. Grzechnik
ABSTRACT We report on the feasibility of high pressure neutron scattering in clamp cells at various diffraction and spectroscopy beamlines in the Heinz Maier-Leibnitz Zentrum in Garching (Germany). The cells are compact in order to fit into the existing sample environment devices and to accommodate samples up to about 150 mm³ at pressures above 1 GPa.
{"title":"Clamp cells for high pressure neutron scattering at low temperatures and high magnetic fields at Heinz Maier-Leibnitz Zentrum (MLZ)","authors":"A. Eich, M. Hölzle, Y. Su, V. Hutanu, R. Georgii, L. Beddrich, A. Grzechnik","doi":"10.1080/08957959.2020.1841759","DOIUrl":"https://doi.org/10.1080/08957959.2020.1841759","url":null,"abstract":"ABSTRACT We report on the feasibility of high pressure neutron scattering in clamp cells at various diffraction and spectroscopy beamlines in the Heinz Maier-Leibnitz Zentrum in Garching (Germany). The cells are compact in order to fit into the existing sample environment devices and to accommodate samples up to about 150 mm³ at pressures above 1 GPa.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"88 - 96"},"PeriodicalIF":2.0,"publicationDate":"2020-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1841759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45767728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.1080/08957959.2020.1830079
S. A. Moreira, M. Pintado, J. Saraiva
ABSTRACT Winter savory is often used in traditional medicine, having several recognized biological properties. This study aimed to evaluate the effect of high pressure-assisted extraction (HPE) and its optimization by response surface methodology to obtain winter savory extracts with a high content of bioactive compounds and high antioxidant activity (the effect of extraction pressure, extraction time, and ethanol concentration were investigated). Results showed that data could be well fitted to second-order polynomial mathematical models for total phenolics, total flavonoids, chlorophylls, carotenoids, and extraction yield, as well as for antioxidant activity. The models predicted optimal conditions ranging 200–500 MPa, extraction time 1–20 min, and ethanol concentration 0–70% (v,v). In comparison with extraction at atmospheric pressure, HPE showed to be more efficient, allowing obtaining an increase of about 40% for all compounds, and an increase of 29, 48, and 70% for antioxidant activity by FRAP, DPPH and ABTS assays, respectively. GRAPHICAL ABSTRACT
{"title":"Optimization of antioxidant activity and bioactive compounds extraction of winter savory leaves by high hydrostatic pressure","authors":"S. A. Moreira, M. Pintado, J. Saraiva","doi":"10.1080/08957959.2020.1830079","DOIUrl":"https://doi.org/10.1080/08957959.2020.1830079","url":null,"abstract":"ABSTRACT Winter savory is often used in traditional medicine, having several recognized biological properties. This study aimed to evaluate the effect of high pressure-assisted extraction (HPE) and its optimization by response surface methodology to obtain winter savory extracts with a high content of bioactive compounds and high antioxidant activity (the effect of extraction pressure, extraction time, and ethanol concentration were investigated). Results showed that data could be well fitted to second-order polynomial mathematical models for total phenolics, total flavonoids, chlorophylls, carotenoids, and extraction yield, as well as for antioxidant activity. The models predicted optimal conditions ranging 200–500 MPa, extraction time 1–20 min, and ethanol concentration 0–70% (v,v). In comparison with extraction at atmospheric pressure, HPE showed to be more efficient, allowing obtaining an increase of about 40% for all compounds, and an increase of 29, 48, and 70% for antioxidant activity by FRAP, DPPH and ABTS assays, respectively. GRAPHICAL ABSTRACT","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"40 1","pages":"543 - 560"},"PeriodicalIF":2.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1830079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45587979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-01DOI: 10.1080/08957959.2020.1830080
M. Wilding, C. Ridley, C. Bull, J. Parise
ABSTRACT We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.
{"title":"In situ formation of coestite under hydrothermal conditions","authors":"M. Wilding, C. Ridley, C. Bull, J. Parise","doi":"10.1080/08957959.2020.1830080","DOIUrl":"https://doi.org/10.1080/08957959.2020.1830080","url":null,"abstract":"ABSTRACT We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"40 1","pages":"478 - 487"},"PeriodicalIF":2.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2020.1830080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41370652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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