Pub Date : 2022-01-02DOI: 10.1080/08957959.2022.2032032
S. Boccato, Y. Garino, G. Morard, B. Zhao, F. Xu, C. Sanloup, A. King, N. Guignot, A. Clark, G. Garbarino, M. Morand, D. Antonangeli
ABSTRACT The diffuse scattering signal of amorphous or liquid systems contains information on the local atomic structure, and this can be related to the density, compressibility, thermal expansion and other thermoelastic properties. However, the analysis and full exploitation of the diffuse scattering signal, in particular for systems under extreme conditions of high pressures and temperatures are difficult to handle. Amorpheus is a Python-based software allowing the determination of the structure factor and the radial distribution function of amorphous and liquid systems. Based on previously reported methodologies, Amorpheus stands out for the implementation of automatic algorithms allowing the user to choose the most suitable parameters for the data treatment and making possible systematic analysis of datasets collected in experiments carried out in Paris-Edinburgh press, multi-anvil apparatus or diamond anvil cell.
{"title":"Amorpheus: a Python-based software for the treatment of X-ray scattering data of amorphous and liquid systems","authors":"S. Boccato, Y. Garino, G. Morard, B. Zhao, F. Xu, C. Sanloup, A. King, N. Guignot, A. Clark, G. Garbarino, M. Morand, D. Antonangeli","doi":"10.1080/08957959.2022.2032032","DOIUrl":"https://doi.org/10.1080/08957959.2022.2032032","url":null,"abstract":"ABSTRACT The diffuse scattering signal of amorphous or liquid systems contains information on the local atomic structure, and this can be related to the density, compressibility, thermal expansion and other thermoelastic properties. However, the analysis and full exploitation of the diffuse scattering signal, in particular for systems under extreme conditions of high pressures and temperatures are difficult to handle. Amorpheus is a Python-based software allowing the determination of the structure factor and the radial distribution function of amorphous and liquid systems. Based on previously reported methodologies, Amorpheus stands out for the implementation of automatic algorithms allowing the user to choose the most suitable parameters for the data treatment and making possible systematic analysis of datasets collected in experiments carried out in Paris-Edinburgh press, multi-anvil apparatus or diamond anvil cell.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"42 1","pages":"69 - 93"},"PeriodicalIF":2.0,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45220039","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 : 2022-01-01Epub Date: 2022-06-07DOI: 10.1007/s10389-022-01722-2
Ruth Dickey-Chasins, Katelyn F Romm, Amita N Vyas, Karen McDonnell, Yan Wang, Yan Ma, Carla J Berg
Background: Many states, local authorities, organizations, and individuals have taken action to reduce the spread of COVID-19, particularly focused on restricting social interactions. Such actions have raised controversy regarding their implications for the spread of COVID-19 versus mental health.
Methods: We examined correlates of: (1) COVID symptoms and test results (i.e., no symptoms/tested negative, symptoms but not tested, tested positive), and (2) mental health symptoms (depressive/anxiety symptoms, COVID-related stress). Data were drawn from Fall 2020 surveys of young adults (n = 2576; Mage = 24.67; 55.8% female; 31.0% sexual minority; 5.4% Black; 12.7% Asian; 11.1% Hispanic) in six metropolitan statistical areas (MSAs) with distinct COVID-related state orders. Correlates of interest included MSA, social distancing behaviors, employment status/nature, household composition, and political orientation.
Results: Overall, 3.0% tested positive for COVID-19; 7.0% had symptoms but no test; 29.1% reported at least moderate depressive/anxiety symptoms on the PHQ-4 Questionnaire. Correlates of testing positive (vs. having no symptoms) included residing in Oklahoma City vs. Boston, San Diego, or Seattle and less social distancing adherence; there were few differences between those without symptoms/negative test and those with symptoms but not tested. Correlates of greater depressive/anxiety symptoms included greater social distancing adherence, being unemployed/laid off (vs. working outside of the home), living with others (other than partners/children), and being Democrat but not Republican (vs. no lean); findings related to COVID-specific stress were similar.
Conclusion: Despite curbing the pandemic, social distancing and individual (e.g., political) and environmental factors that restrict social interaction have negative implications for mental health.
{"title":"Social distancing and related factors during the COVID-19 pandemic in relation to COVID-19 symptoms and diagnosis and mental health.","authors":"Ruth Dickey-Chasins, Katelyn F Romm, Amita N Vyas, Karen McDonnell, Yan Wang, Yan Ma, Carla J Berg","doi":"10.1007/s10389-022-01722-2","DOIUrl":"10.1007/s10389-022-01722-2","url":null,"abstract":"<p><strong>Background: </strong>Many states, local authorities, organizations, and individuals have taken action to reduce the spread of COVID-19, particularly focused on restricting social interactions. Such actions have raised controversy regarding their implications for the spread of COVID-19 versus mental health.</p><p><strong>Methods: </strong>We examined correlates of: (1) COVID symptoms and test results (i.e., no symptoms/tested negative, symptoms but not tested, tested positive), and (2) mental health symptoms (depressive/anxiety symptoms, COVID-related stress). Data were drawn from Fall 2020 surveys of young adults (n = 2576; <i>M</i> <sub>age</sub> = 24.67; 55.8% female; 31.0% sexual minority; 5.4% Black; 12.7% Asian; 11.1% Hispanic) in six metropolitan statistical areas (MSAs) with distinct COVID-related state orders. Correlates of interest included MSA, social distancing behaviors, employment status/nature, household composition, and political orientation.</p><p><strong>Results: </strong>Overall, 3.0% tested positive for COVID-19; 7.0% had symptoms but no test; 29.1% reported at least moderate depressive/anxiety symptoms on the PHQ-4 Questionnaire. Correlates of testing positive (vs. having no symptoms) included residing in Oklahoma City vs. Boston, San Diego, or Seattle and less social distancing adherence; there were few differences between those without symptoms/negative test and those with symptoms but not tested. Correlates of greater depressive/anxiety symptoms included greater social distancing adherence, being unemployed/laid off (vs. working outside of the home), living with others (other than partners/children), and being Democrat but not Republican (vs. no lean); findings related to COVID-specific stress were similar.</p><p><strong>Conclusion: </strong>Despite curbing the pandemic, social distancing and individual (e.g., political) and environmental factors that restrict social interaction have negative implications for mental health.</p>","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"18 1","pages":"2339-2349"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9173837/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81835168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-16DOI: 10.1080/08957959.2021.2012570
Israel Roger Montoya Matos, N. Balzaretti
ABSTRACT The effect of high pressure (7.7 GPa) densification on the absorption and near-infrared emission of Nd-doped lithium, sodium and potassium disilicate glasses was investigated. Judd-Ofelt parameters Ωλ (λ = 2, 4 and 6) were calculated from the absorption spectra, before and after densification of glasses, indicating that the irreversible structural changes induced by pressure increased the symmetry of the Nd-O bonding. Density and refractive index of the glasses also increased, probably related to the close packing of SiO4 tetrahedra during densification. The magnitude of the splitting due to the Stark effect was larger for potassium silicate, before and after densification. The radiative transition probabilities of the hypersensitive transition for sodium and potassium silicate increased after densification while the radiative lifetime decreased. For lithium silicate, the opposite behavior was observed. The experimental results corroborate the influence of alkali ion and densification on the luminescence properties of Nd-doped alkali silicate glasses.
{"title":"High pressure effect in the near-infrared emission of Nd3+-doped alkali silicate glasses","authors":"Israel Roger Montoya Matos, N. Balzaretti","doi":"10.1080/08957959.2021.2012570","DOIUrl":"https://doi.org/10.1080/08957959.2021.2012570","url":null,"abstract":"ABSTRACT The effect of high pressure (7.7 GPa) densification on the absorption and near-infrared emission of Nd-doped lithium, sodium and potassium disilicate glasses was investigated. Judd-Ofelt parameters Ωλ (λ = 2, 4 and 6) were calculated from the absorption spectra, before and after densification of glasses, indicating that the irreversible structural changes induced by pressure increased the symmetry of the Nd-O bonding. Density and refractive index of the glasses also increased, probably related to the close packing of SiO4 tetrahedra during densification. The magnitude of the splitting due to the Stark effect was larger for potassium silicate, before and after densification. The radiative transition probabilities of the hypersensitive transition for sodium and potassium silicate increased after densification while the radiative lifetime decreased. For lithium silicate, the opposite behavior was observed. The experimental results corroborate the influence of alkali ion and densification on the luminescence properties of Nd-doped alkali silicate glasses.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"42 1","pages":"1 - 13"},"PeriodicalIF":2.0,"publicationDate":"2021-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44014662","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 : 2021-12-13DOI: 10.1080/08957959.2021.2013834
Chao Liu, T. Yoshino, D. Yamazaki, N. Tsujino, H. Gomi, M. Sakurai, Youyue Zhang, Ran Wang, L. Guan, Kayan Lau, Y. Tange, Y. Higo
ABSTRACT Anelastic measurement by cyclic loading under high pressure has been developed by means of in situ X-ray observation at a synchrotron facility. In this method, the reference material is a key factor to precisely determine attenuation and moduli of unknown materials. We compared the performance of three types of reference materials (dense polycrystalline alumina, alumina single-crystal parallel to c-axis, and flexible graphite) under the pressure of 3 GPa and the temperature range between 1173 and 1373 K. The phase lags of strain between reference materials and samples show that the flexible graphite is less attenuated than dense polycrystalline alumina and alumina single crystal in various periods. The strain ratios show that the flexible graphite is much softer and can produce the measurable strain in the limited displacement. The flexible graphite, as reference material, is more excellent to detect the relatively lower energy dispersion of mantle minerals at high pressure.
{"title":"Exploration of the best reference material on anelastic measurement by cyclic loading under high pressure","authors":"Chao Liu, T. Yoshino, D. Yamazaki, N. Tsujino, H. Gomi, M. Sakurai, Youyue Zhang, Ran Wang, L. Guan, Kayan Lau, Y. Tange, Y. Higo","doi":"10.1080/08957959.2021.2013834","DOIUrl":"https://doi.org/10.1080/08957959.2021.2013834","url":null,"abstract":"ABSTRACT Anelastic measurement by cyclic loading under high pressure has been developed by means of in situ X-ray observation at a synchrotron facility. In this method, the reference material is a key factor to precisely determine attenuation and moduli of unknown materials. We compared the performance of three types of reference materials (dense polycrystalline alumina, alumina single-crystal parallel to c-axis, and flexible graphite) under the pressure of 3 GPa and the temperature range between 1173 and 1373 K. The phase lags of strain between reference materials and samples show that the flexible graphite is less attenuated than dense polycrystalline alumina and alumina single crystal in various periods. The strain ratios show that the flexible graphite is much softer and can produce the measurable strain in the limited displacement. The flexible graphite, as reference material, is more excellent to detect the relatively lower energy dispersion of mantle minerals at high pressure.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"42 1","pages":"14 - 28"},"PeriodicalIF":2.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46108702","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 : 2021-10-05DOI: 10.1080/08957959.2021.2013835
R. Khasanov, Ross Urquhart, M. Elender, K. Kamenev
ABSTRACT A three-wall piston-cylinder type high pressure cell for muon-spin rotation/relaxation experiments was designed, manufactured, tested and commissioned. The outer cylinder of the cell body is made from MP35N and the middle and inner cylinders are made from NiCrAl nonmagnetic alloys. The mechanical design and performance of the pressure cell are evaluated and optimised using finite-element analysis. The outcomes of the experimental testing closely match the modelling results. The high pressure cell is shown to reach pressure of up to 3.3 GPa at ambient temperature, corresponding to 3.0 GPa at low temperatures, without irreversible damage.
{"title":"Three-wall piston-cylinder type pressure cell for muon-spin rotation/relaxation experiments","authors":"R. Khasanov, Ross Urquhart, M. Elender, K. Kamenev","doi":"10.1080/08957959.2021.2013835","DOIUrl":"https://doi.org/10.1080/08957959.2021.2013835","url":null,"abstract":"ABSTRACT A three-wall piston-cylinder type high pressure cell for muon-spin rotation/relaxation experiments was designed, manufactured, tested and commissioned. The outer cylinder of the cell body is made from MP35N and the middle and inner cylinders are made from NiCrAl nonmagnetic alloys. The mechanical design and performance of the pressure cell are evaluated and optimised using finite-element analysis. The outcomes of the experimental testing closely match the modelling results. The high pressure cell is shown to reach pressure of up to 3.3 GPa at ambient temperature, corresponding to 3.0 GPa at low temperatures, without irreversible damage.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"42 1","pages":"29 - 46"},"PeriodicalIF":2.0,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48295392","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 : 2021-10-02DOI: 10.1080/08957959.2021.1998479
A. N. Kruk, Alexander A. Korablin, A. Sokol, Y. Palyanov
ABSTRACT The isothermal section of the Fe-Fe3C-Fe3N phase diagram at 7.8 GPa and 1150°С comprises a three-phase field of γ-Fe + Fe3C + ϵ-Fe3(С/N) in the central part and three two-phase fields (γ-Fe + Fe3C, γ-Fe + ϵ-Fe3 (С/N) and Fe3C + ϵ-Fe3(С/N)) bounded by three single-phase fields of γ-Fe, Fe3C and ϵ-Fe3(С/N) solid solutions along the triangle sides. Thus, native iron can host carbon and nitrogen in the γ-Fe + Fe3C or γ-Fe phases in the mantle depleted in volatiles (20 ppm C and 1 ppm N) at temperatures corresponding to the ∼35 mW/m2 heat flux, and in the Fe3C or ϵ-Fe3(С/N) phases if the contents of volatiles in the mantle reach 250 ppm C and 100 ppm N. Iron carbonitride has quite a large stability field even at low nitrogen concentrations in the system simulating native iron.
{"title":"Phase relations in the Fe-Fe3C-Fe3N system at 7.8 GPa and 1150°C: implications for C and N hosts in metal-saturated mantle","authors":"A. N. Kruk, Alexander A. Korablin, A. Sokol, Y. Palyanov","doi":"10.1080/08957959.2021.1998479","DOIUrl":"https://doi.org/10.1080/08957959.2021.1998479","url":null,"abstract":"ABSTRACT The isothermal section of the Fe-Fe3C-Fe3N phase diagram at 7.8 GPa and 1150°С comprises a three-phase field of γ-Fe + Fe3C + ϵ-Fe3(С/N) in the central part and three two-phase fields (γ-Fe + Fe3C, γ-Fe + ϵ-Fe3 (С/N) and Fe3C + ϵ-Fe3(С/N)) bounded by three single-phase fields of γ-Fe, Fe3C and ϵ-Fe3(С/N) solid solutions along the triangle sides. Thus, native iron can host carbon and nitrogen in the γ-Fe + Fe3C or γ-Fe phases in the mantle depleted in volatiles (20 ppm C and 1 ppm N) at temperatures corresponding to the ∼35 mW/m2 heat flux, and in the Fe3C or ϵ-Fe3(С/N) phases if the contents of volatiles in the mantle reach 250 ppm C and 100 ppm N. Iron carbonitride has quite a large stability field even at low nitrogen concentrations in the system simulating native iron.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"392 - 404"},"PeriodicalIF":2.0,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59888113","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 : 2021-10-02DOI: 10.1080/08957959.2021.1998478
R. Tsuruoka, H. Terasaki, S. Kamada, F. Maeda, T. Kondo, N. Hirao, S. Kawaguchi, Iori Yamada, S. Urakawa, A. Machida
ABSTRACT The density of liquid metals at high pressure and high-temperature provides fundamental and important information for understanding their compression behavior and elastic properties. In this study, the densities of liquid gallium (Ga) were measured up to 10 GPa and 533 K using the X-ray absorption method combined with an externally heated diamond anvil cell. The elastic properties (the isothermal bulk modulus (KT0 ), and its pressure derivative (KT0’)) of liquid Ga were obtained by fitting the density data with three equations of state (EOSs) (Murnaghan, third order Birch–Murnaghan, and Vinet). The KT0 values of liquid Ga were determined to be 45.7 ± 1.0–51.7 ± 1.0 GPa at 500 K assuming KT0’ values of 4–6. The obtained KT0 or KT0 ′ showed almost the same values regardless of the EOS used. Compared with previous results, the compression curve of liquid Ga obtained in this study had a slightly stiffer trend at higher pressures.
{"title":"Density and elastic properties of liquid gallium up to 10 GPa using X-ray absorption method combined with externally heated diamond anvil cell","authors":"R. Tsuruoka, H. Terasaki, S. Kamada, F. Maeda, T. Kondo, N. Hirao, S. Kawaguchi, Iori Yamada, S. Urakawa, A. Machida","doi":"10.1080/08957959.2021.1998478","DOIUrl":"https://doi.org/10.1080/08957959.2021.1998478","url":null,"abstract":"ABSTRACT The density of liquid metals at high pressure and high-temperature provides fundamental and important information for understanding their compression behavior and elastic properties. In this study, the densities of liquid gallium (Ga) were measured up to 10 GPa and 533 K using the X-ray absorption method combined with an externally heated diamond anvil cell. The elastic properties (the isothermal bulk modulus (KT0 ), and its pressure derivative (KT0’)) of liquid Ga were obtained by fitting the density data with three equations of state (EOSs) (Murnaghan, third order Birch–Murnaghan, and Vinet). The KT0 values of liquid Ga were determined to be 45.7 ± 1.0–51.7 ± 1.0 GPa at 500 K assuming KT0’ values of 4–6. The obtained KT0 or KT0 ′ showed almost the same values regardless of the EOS used. Compared with previous results, the compression curve of liquid Ga obtained in this study had a slightly stiffer trend at higher pressures.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"379 - 391"},"PeriodicalIF":2.0,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47250685","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 : 2021-10-02DOI: 10.1080/08957959.2021.1981308
M. Gao, Kazuki Nomura, Y. Ando, Yoshiko Nakaura, Zhenya Zhang, Kazutaka Yamamoto
ABSTRACT Apple was impregnated with pigment solution by vacuum heat sealing (VS) and/or high hydrostatic pressure treatment (HHP; 100-600 MPa, 25°C, 5 min). Impregnation efficacy was evaluated as impregnation ratio (%) by image analysis, while damages of cell membrane and texture were quantified by electrical impedance spectroscopy and texture analysis, respectively. Combinations of VS and HHP exclusively achieved 100% impregnation. Meanwhile, the damage was comparable between the samples after VS and VS+100 MPa treatment and aggravated by elevated levels of HHP. As for the texture, breaking stress (hardness) decreased after VS and VS+HHP (100-600 MPa) comparably. Meanwhile, breaking strain (deformability) significantly increased after VS+HHP (200-600 MPa), indicating further damage of strain texture as compared with that after VS and VS+100 MPa treatment. It was indicated that impregnation of apple was fully achieved by a combination of VS and 100 MPa treatment, while minimizing the cell membrane and texture damages.
{"title":"Vacuum impregnation of apple assisted by high hydrostatic pressure","authors":"M. Gao, Kazuki Nomura, Y. Ando, Yoshiko Nakaura, Zhenya Zhang, Kazutaka Yamamoto","doi":"10.1080/08957959.2021.1981308","DOIUrl":"https://doi.org/10.1080/08957959.2021.1981308","url":null,"abstract":"ABSTRACT Apple was impregnated with pigment solution by vacuum heat sealing (VS) and/or high hydrostatic pressure treatment (HHP; 100-600 MPa, 25°C, 5 min). Impregnation efficacy was evaluated as impregnation ratio (%) by image analysis, while damages of cell membrane and texture were quantified by electrical impedance spectroscopy and texture analysis, respectively. Combinations of VS and HHP exclusively achieved 100% impregnation. Meanwhile, the damage was comparable between the samples after VS and VS+100 MPa treatment and aggravated by elevated levels of HHP. As for the texture, breaking stress (hardness) decreased after VS and VS+HHP (100-600 MPa) comparably. Meanwhile, breaking strain (deformability) significantly increased after VS+HHP (200-600 MPa), indicating further damage of strain texture as compared with that after VS and VS+100 MPa treatment. It was indicated that impregnation of apple was fully achieved by a combination of VS and 100 MPa treatment, while minimizing the cell membrane and texture damages.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"414 - 428"},"PeriodicalIF":2.0,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44799663","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 : 2021-10-02DOI: 10.1080/08957959.2021.2001466
J. Kamarád, J. Kaštil, M. Friák, M. Mazalová, O. Schneeweiss, Z. Arnold
ABSTRACT Single crystal of the stoichiometric Ni2MnSn alloy (cubic L21 crystal structure) was prepared by the Czochralski method. The values of the magneto-crystalline anisotropy constant K 1 have been determined at temperature 10 K under ambient and high hydrostatic pressures, K 1 = + 0.17 × 104 and +1.96 × 104 J/m3 (0.7 GPa), respectively. The pressure-induced decrease of magnetization was confirmed and hence the significant non-trivial increase of uniaxial anisotropy with increasing pressure points to a possible distortion of the cubic structure of the single crystal under hydrostatic pressure. Simultaneously, the more pronounced and pressure almost insensitive magneto-crystalline anisotropy, K 1 = + 9.1 × 104 J/m3, has been observed in the martensite phase (orthorhombic structure) of the off-stoichiometric Ni2Mn1.43Sn0.57 alloy. The effect of a directional dependence of the Young modulus that was theoretically derived in the case of the Ni2MnSn-based alloys is discussed.
{"title":"Effect of hydrostatic pressure on magneto-crystalline anisotropy of Heusler Ni2MnSn-based alloy","authors":"J. Kamarád, J. Kaštil, M. Friák, M. Mazalová, O. Schneeweiss, Z. Arnold","doi":"10.1080/08957959.2021.2001466","DOIUrl":"https://doi.org/10.1080/08957959.2021.2001466","url":null,"abstract":"ABSTRACT Single crystal of the stoichiometric Ni2MnSn alloy (cubic L21 crystal structure) was prepared by the Czochralski method. The values of the magneto-crystalline anisotropy constant K 1 have been determined at temperature 10 K under ambient and high hydrostatic pressures, K 1 = + 0.17 × 104 and +1.96 × 104 J/m3 (0.7 GPa), respectively. The pressure-induced decrease of magnetization was confirmed and hence the significant non-trivial increase of uniaxial anisotropy with increasing pressure points to a possible distortion of the cubic structure of the single crystal under hydrostatic pressure. Simultaneously, the more pronounced and pressure almost insensitive magneto-crystalline anisotropy, K 1 = + 9.1 × 104 J/m3, has been observed in the martensite phase (orthorhombic structure) of the off-stoichiometric Ni2Mn1.43Sn0.57 alloy. The effect of a directional dependence of the Young modulus that was theoretically derived in the case of the Ni2MnSn-based alloys is discussed.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"405 - 413"},"PeriodicalIF":2.0,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41616906","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 : 2021-10-02DOI: 10.1080/08957959.2021.1985115
L. Chudinovskikh, R. Boehler
ABSTRACT When powders of polycrystalline transparent materials are compressed in the diamond cell, they undergo a change from translucent to transparent. This effect is due to plastic deformation of the grains leading to a reduction in the size of voids responsible for light scattering. The pressures of the onset and saturation of the optical transmission corelate respectively well with the previously reported yield strengths and hardness obtained by different techniques. From ten measurements on MgO, SiO2, Al2O3, olivine, pyroxene, garnet and a perovskite, we find a ratio between hardness and yield strength of three, which is generally accepted. Preliminary high temperature measurements with the double-sided laser heating technique show that this method may be used for determining rheological properties of minerals at P-T conditions of the deep Earth. This technique for obtaining high optical transmission in polycrystalline materials may also be of interest for modern solid state laser materials.
{"title":"Yield strength and hardness of micron-sized powders measured in the diamond cell","authors":"L. Chudinovskikh, R. Boehler","doi":"10.1080/08957959.2021.1985115","DOIUrl":"https://doi.org/10.1080/08957959.2021.1985115","url":null,"abstract":"ABSTRACT When powders of polycrystalline transparent materials are compressed in the diamond cell, they undergo a change from translucent to transparent. This effect is due to plastic deformation of the grains leading to a reduction in the size of voids responsible for light scattering. The pressures of the onset and saturation of the optical transmission corelate respectively well with the previously reported yield strengths and hardness obtained by different techniques. From ten measurements on MgO, SiO2, Al2O3, olivine, pyroxene, garnet and a perovskite, we find a ratio between hardness and yield strength of three, which is generally accepted. Preliminary high temperature measurements with the double-sided laser heating technique show that this method may be used for determining rheological properties of minerals at P-T conditions of the deep Earth. This technique for obtaining high optical transmission in polycrystalline materials may also be of interest for modern solid state laser materials.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"366 - 378"},"PeriodicalIF":2.0,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49041913","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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