Pub Date : 2021-07-03DOI: 10.1080/08957959.2021.1946054
S. Kmiha, C. Modugno, C. Aouadhi, H. Simonin, S. Méjri, J. Perrier-Cornet, A. Maaroufi
ABSTRACT The sensitivity of Paenibacillus sp. and Terribacillus aidingensis spores to combined action of HP, nisin and moderate heating were investigated for the first time. The results showed that the effect of HP on spores varies with pressure level, treatment temperature, spore species and presence of nisin. T. aidingensis spores were more resistant than Paenibacillus sp., whatever the treatment applied. The inactivation rates of both spore species did not exceed 2.7log (CFU/mL) after HP treatment at 600 MPa/50°C/10 min. However, a high synergistic effect of nisin and HP was observed after a treatment at 500 MPa/10 min/50°C with addition of nisin during HP and into the recovery medium, leading to 6log (CFU/mL) and 4log (CFU/mL) reduction for Paenibacillus and Terribacillus spores, respectively. Finally, the fraction of germinated spores by HP was measured and the results showed that germination induction is not the only underlying mechanisms of nisin sensitization by HP.
{"title":"Inhibitory effect of high hydrostatic pressure, nisin, and moderate heating on the inactivation of Paenibacillus sp. and Terribacillus aidingensis spores isolated from UHT milk","authors":"S. Kmiha, C. Modugno, C. Aouadhi, H. Simonin, S. Méjri, J. Perrier-Cornet, A. Maaroufi","doi":"10.1080/08957959.2021.1946054","DOIUrl":"https://doi.org/10.1080/08957959.2021.1946054","url":null,"abstract":"ABSTRACT The sensitivity of Paenibacillus sp. and Terribacillus aidingensis spores to combined action of HP, nisin and moderate heating were investigated for the first time. The results showed that the effect of HP on spores varies with pressure level, treatment temperature, spore species and presence of nisin. T. aidingensis spores were more resistant than Paenibacillus sp., whatever the treatment applied. The inactivation rates of both spore species did not exceed 2.7log (CFU/mL) after HP treatment at 600 MPa/50°C/10 min. However, a high synergistic effect of nisin and HP was observed after a treatment at 500 MPa/10 min/50°C with addition of nisin during HP and into the recovery medium, leading to 6log (CFU/mL) and 4log (CFU/mL) reduction for Paenibacillus and Terribacillus spores, respectively. Finally, the fraction of germinated spores by HP was measured and the results showed that germination induction is not the only underlying mechanisms of nisin sensitization by HP.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"328 - 340"},"PeriodicalIF":2.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1946054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46130767","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 : 2021-07-03DOI: 10.1080/08957959.2021.1940999
K. Bao, Xianfeng Zhang, Guiji Wang, T. Chong, Jia-jie Deng, D. Han, M. Tan
ABSTRACT The indirect method of obtaining in situ particle velocity of sample, under dynamic high-pressure loading experiments, generates an error due to the influence of rarefaction wave from the sample-window interface. Using the spinel as a window is an attractive method to reduce the error due to the total impedance matching of sample and window in the loading experiments of the spinel. To explore the possibility of the spinel as a window, ramp wave compression experiments were conducted to determine the refractive index of loading longitudinal stress range below 15.9 GPa. The result showed smooth particle velocity curve and linear relationship between refractive index and density. The effect of temperature on refractive index can be negligible, proved by analyzing the effect of temperature on polarizability. It is indicated that the spinel can be used as a window for loading experiments of the spinel and similar impedance materials.
{"title":"Refractive index of MgAl2O4 transparent ceramic under quasi-isentropic compression loading","authors":"K. Bao, Xianfeng Zhang, Guiji Wang, T. Chong, Jia-jie Deng, D. Han, M. Tan","doi":"10.1080/08957959.2021.1940999","DOIUrl":"https://doi.org/10.1080/08957959.2021.1940999","url":null,"abstract":"ABSTRACT The indirect method of obtaining in situ particle velocity of sample, under dynamic high-pressure loading experiments, generates an error due to the influence of rarefaction wave from the sample-window interface. Using the spinel as a window is an attractive method to reduce the error due to the total impedance matching of sample and window in the loading experiments of the spinel. To explore the possibility of the spinel as a window, ramp wave compression experiments were conducted to determine the refractive index of loading longitudinal stress range below 15.9 GPa. The result showed smooth particle velocity curve and linear relationship between refractive index and density. The effect of temperature on refractive index can be negligible, proved by analyzing the effect of temperature on polarizability. It is indicated that the spinel can be used as a window for loading experiments of the spinel and similar impedance materials.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"209 - 218"},"PeriodicalIF":2.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1940999","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46840842","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 : 2021-07-03DOI: 10.1080/08957959.2021.1957863
E. O’Bannon, P. Söderlind, D. Sneed, M. Lipp, H. Cynn, J. S. Smith, C. Park, Z. Jenei
ABSTRACT Isostructural transitions have been reported to occur in several pure elements; however, most of these have been disproven. Zr is one of those elements which remains controversial with two reports of an isostructural bcc-to-bcc transition at ∼56–60 GPa at an ambient temperature and a more recent report proposing a second bcc-to-bcc transition at 110 GPa. Here, we report a detailed experimental and theoretical study of zirconium in the pressure region of the proposed isostructural transition(s). We conducted three room temperature static compression experiments using Ne as a pressure transmitting medium up to 80 GPa. We see no evidence for an isostructural transition finding a smooth compression curve for β-Zr. We determined the theoretical volume, elastic parameters, and Poisson’s ratio for β-Zr up to 717 GPa and no obvious anomalies are identified. Our new results join the growing body of evidence that does not find evidence of isostructural transitions in β-Zr.
{"title":"High pressure stability of β-Zr: no evidence for isostructural phase transitions","authors":"E. O’Bannon, P. Söderlind, D. Sneed, M. Lipp, H. Cynn, J. S. Smith, C. Park, Z. Jenei","doi":"10.1080/08957959.2021.1957863","DOIUrl":"https://doi.org/10.1080/08957959.2021.1957863","url":null,"abstract":"ABSTRACT Isostructural transitions have been reported to occur in several pure elements; however, most of these have been disproven. Zr is one of those elements which remains controversial with two reports of an isostructural bcc-to-bcc transition at ∼56–60 GPa at an ambient temperature and a more recent report proposing a second bcc-to-bcc transition at 110 GPa. Here, we report a detailed experimental and theoretical study of zirconium in the pressure region of the proposed isostructural transition(s). We conducted three room temperature static compression experiments using Ne as a pressure transmitting medium up to 80 GPa. We see no evidence for an isostructural transition finding a smooth compression curve for β-Zr. We determined the theoretical volume, elastic parameters, and Poisson’s ratio for β-Zr up to 717 GPa and no obvious anomalies are identified. Our new results join the growing body of evidence that does not find evidence of isostructural transitions in β-Zr.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"247 - 266"},"PeriodicalIF":2.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1957863","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43756141","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 : 2021-07-03DOI: 10.1080/08957959.2021.1957864
G. Joseph, C. K. Kamalakanth, K. R. Remya Kumari, J. Bindu, K. K. Asha
ABSTRACT Chilled storage stability of marinated and high pressure treated peeled and undeveined Indian white prawns (Fenneropenaeus indicus) were studied. The prawns were marinated with condiments viz. chilli powder, salt and turmeric, and - vacuum packed in ethylene-vinyl alcohol copolymer pouches. Marinated unpressurized prawn samples were kept as control. The products were stored at 2 ± 1°C for evaluating - shelf life by analysing biochemical, microbiological and organoleptic parameters. Pressurization significantly altered the quality indices such as pH, total volatile basic nitrogen, free fatty acid, thiobarbituric acid, total plate count and overall acceptability of samples. The control and 200 MPa treated sample were rejected on 20th and 25th day of storage respectively, whereas 250 and 300 MPa treated samples achieved a shelf life of 35 days. Among the samples, the prawns treated at 250 MPa were found to be organoleptically superior with respect to its biochemical and microbiological quality parameters.
{"title":"Chilled storage stability of spice marinated and high pressure processed Indian white prawns (Fenneropenaeus indicus)","authors":"G. Joseph, C. K. Kamalakanth, K. R. Remya Kumari, J. Bindu, K. K. Asha","doi":"10.1080/08957959.2021.1957864","DOIUrl":"https://doi.org/10.1080/08957959.2021.1957864","url":null,"abstract":"ABSTRACT Chilled storage stability of marinated and high pressure treated peeled and undeveined Indian white prawns (Fenneropenaeus indicus) were studied. The prawns were marinated with condiments viz. chilli powder, salt and turmeric, and - vacuum packed in ethylene-vinyl alcohol copolymer pouches. Marinated unpressurized prawn samples were kept as control. The products were stored at 2 ± 1°C for evaluating - shelf life by analysing biochemical, microbiological and organoleptic parameters. Pressurization significantly altered the quality indices such as pH, total volatile basic nitrogen, free fatty acid, thiobarbituric acid, total plate count and overall acceptability of samples. The control and 200 MPa treated sample were rejected on 20th and 25th day of storage respectively, whereas 250 and 300 MPa treated samples achieved a shelf life of 35 days. Among the samples, the prawns treated at 250 MPa were found to be organoleptically superior with respect to its biochemical and microbiological quality parameters.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"27 1","pages":"341 - 351"},"PeriodicalIF":2.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1957864","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59888357","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 : 2021-06-08DOI: 10.1080/08957959.2021.1961765
K. Cherednichenko, Y. Le Godec, V. Solozhenko
ABSTRACT Two novels boron-rich selenides, orthorhombic B6Se and rhombohedral B12Se, have been recently synthesized at high pressures and high temperatures. Room-temperature compressibilities of these phases were studied in a diamond anvil cell using synchrotron powder X-ray diffraction. A fit of experimental p–V data by the third-order Birch–Murnaghan equation of state yielded the bulk moduli of 155(2) GPa for B12Se and 144(3) GPa for B6Se. No pressure-induced phase transitions have been observed in the studied pressure range, that is, up to 35 GPa.
{"title":"Equations of state of new boron-rich selenides B6Se and B12Se","authors":"K. Cherednichenko, Y. Le Godec, V. Solozhenko","doi":"10.1080/08957959.2021.1961765","DOIUrl":"https://doi.org/10.1080/08957959.2021.1961765","url":null,"abstract":"ABSTRACT Two novels boron-rich selenides, orthorhombic B6Se and rhombohedral B12Se, have been recently synthesized at high pressures and high temperatures. Room-temperature compressibilities of these phases were studied in a diamond anvil cell using synchrotron powder X-ray diffraction. A fit of experimental p–V data by the third-order Birch–Murnaghan equation of state yielded the bulk moduli of 155(2) GPa for B12Se and 144(3) GPa for B6Se. No pressure-induced phase transitions have been observed in the studied pressure range, that is, up to 35 GPa.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"267 - 274"},"PeriodicalIF":2.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41522085","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 : 2021-04-03DOI: 10.1080/08957959.2021.1921173
G. Spiekermann, L. Libon, C. Albers, R. Sakrowski, S. Petitgirard, C. Sahle, M. Sundermann, H. Gretarsson, I. Sergueev, C. Sternemann, M. Wilke, M. Murakami
ABSTRACT We describe the use of a silver-coated 90 parabolic mirror of 33 mm focal length as objective for imaging, on-axis laser heating and radiospectrometric temperature measurements of a sample compressed in a diamond anvil cell in a laser heating system. There, spatial resolution and imaging quality of the parabolic mirror are similar to the one of a 10× objective. The temperature measurements between 500 and 900 nm are essentially free from chromatic aberration. The parabolic mirror was also perforated with a 220-μm hole, allowing for on-axis imaging, laser heating and incidence of X-rays simultaneously at synchrotron facilities. The parabolic mirror is thus a well-suited alternative to existing refractive and reflective objectives in laboratory and synchrotron laser heating systems.
{"title":"Reflective imaging, on-axis laser heating and radiospectrometry of samples in diamond anvil cells with a parabolic mirror","authors":"G. Spiekermann, L. Libon, C. Albers, R. Sakrowski, S. Petitgirard, C. Sahle, M. Sundermann, H. Gretarsson, I. Sergueev, C. Sternemann, M. Wilke, M. Murakami","doi":"10.1080/08957959.2021.1921173","DOIUrl":"https://doi.org/10.1080/08957959.2021.1921173","url":null,"abstract":"ABSTRACT We describe the use of a silver-coated 90 parabolic mirror of 33 mm focal length as objective for imaging, on-axis laser heating and radiospectrometric temperature measurements of a sample compressed in a diamond anvil cell in a laser heating system. There, spatial resolution and imaging quality of the parabolic mirror are similar to the one of a 10× objective. The temperature measurements between 500 and 900 nm are essentially free from chromatic aberration. The parabolic mirror was also perforated with a 220-μm hole, allowing for on-axis imaging, laser heating and incidence of X-rays simultaneously at synchrotron facilities. The parabolic mirror is thus a well-suited alternative to existing refractive and reflective objectives in laboratory and synchrotron laser heating systems.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"142 - 154"},"PeriodicalIF":2.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1921173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48136898","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 : 2021-04-03DOI: 10.1080/08957959.2021.1910254
C. M. Howard, N. Walte
ABSTRACT A new custom-designed cooling system is described that was developed for the SAPHiR three-axis multi-anvil press with MA6-6 anvil geometry at the FRM II neutron source in Garching. The system was designed to remove heat from the secondary anvils by flowing a cryogen around custom-designed cooling rings or cooling jackets. Currently, this cryo-system is capable of achieving temperatures of 83 K without interfering with the anvil geometry and pressure transfer, thus not limiting the attainable maximum pressure or the capability of performing deformation experiments. In this study, pressures of up to ca. 8 GPa were attained at 83 K with sample volumes up to 130 mm3. The system is portable and can be implemented into any three-axis multi-anvil press with a MA6-6 anvil geometry, opening up new areas of high pressure cryo-research at synchrotron and neutron facilities, including investigating the interior of icy moons.
{"title":"New cooling system for a three-axis multi-anvil press with 6-6 geometry","authors":"C. M. Howard, N. Walte","doi":"10.1080/08957959.2021.1910254","DOIUrl":"https://doi.org/10.1080/08957959.2021.1910254","url":null,"abstract":"ABSTRACT A new custom-designed cooling system is described that was developed for the SAPHiR three-axis multi-anvil press with MA6-6 anvil geometry at the FRM II neutron source in Garching. The system was designed to remove heat from the secondary anvils by flowing a cryogen around custom-designed cooling rings or cooling jackets. Currently, this cryo-system is capable of achieving temperatures of 83 K without interfering with the anvil geometry and pressure transfer, thus not limiting the attainable maximum pressure or the capability of performing deformation experiments. In this study, pressures of up to ca. 8 GPa were attained at 83 K with sample volumes up to 130 mm3. The system is portable and can be implemented into any three-axis multi-anvil press with a MA6-6 anvil geometry, opening up new areas of high pressure cryo-research at synchrotron and neutron facilities, including investigating the interior of icy moons.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"119 - 131"},"PeriodicalIF":2.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1910254","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44247968","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 : 2021-04-03DOI: 10.1080/08957959.2021.1931168
Guoyin Shen, Jesse S. Smith, C. Kenney-Benson, S. Klotz
ABSTRACT We have measured the luminescence shifts of the ruby’s R1- and R2-lines and the line of 5D0→7F0 from Sm2+:SrFCl corresponding to the melting pressure of mercury that is recommended by the AIRAPT task force as an International Practical Pressure Scale (IPPS). The linear coefficients of the pressure dependence of the R1-, R2-lines, and the luminescence line of Sm2+:SrFCl are determined to be 0.3722 ± 0.002, 0.3796 ± 0.002, and 1.123 ± 0.002 nm/GPa, respectively. The results not only put tight constraints on the initial slopes of ruby and Sm2+:SrFCl gauges, but also link the luminescence-based pressure gauges to the more fundamental primary piston gauges.
{"title":"Calibration of ruby (Cr3+:Al2O3) and Sm2+:SrFCl luminescence lines from the melting of mercury: constraints on the initial slopes","authors":"Guoyin Shen, Jesse S. Smith, C. Kenney-Benson, S. Klotz","doi":"10.1080/08957959.2021.1931168","DOIUrl":"https://doi.org/10.1080/08957959.2021.1931168","url":null,"abstract":"ABSTRACT We have measured the luminescence shifts of the ruby’s R1- and R2-lines and the line of 5D0→7F0 from Sm2+:SrFCl corresponding to the melting pressure of mercury that is recommended by the AIRAPT task force as an International Practical Pressure Scale (IPPS). The linear coefficients of the pressure dependence of the R1-, R2-lines, and the luminescence line of Sm2+:SrFCl are determined to be 0.3722 ± 0.002, 0.3796 ± 0.002, and 1.123 ± 0.002 nm/GPa, respectively. The results not only put tight constraints on the initial slopes of ruby and Sm2+:SrFCl gauges, but also link the luminescence-based pressure gauges to the more fundamental primary piston gauges.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"175 - 183"},"PeriodicalIF":2.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1931168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43461760","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 : 2021-04-03DOI: 10.1080/08957959.2021.1924702
I. Korobeynikov, A. Y. Usik, T. E. Govorkova, S. Emelyanova, V. Marchenkov
ABSTRACT The Heusler alloys are promising material for various applications, including thermoelectric power generators. There are several ways to improve their properties, among which the substitution of constituent elements, nanostructuring, temperature treatment, thin films engineering etc. This work is devoted to the experimental study of thermoelectric properties of Fe–V–Al-based Heusler alloys with different compositions under high pressure. The Seebeck coefficient and electrical resistance of several compounds were measured as a function of applied pressure up to 10 GPa at room temperature. The experimental results demonstrated a diversity of pressure responses of the thermoelectric properties that can be observed in chemically similar Heusler alloys under variation in their compositions. Moderate enhancing of the thermoelectric power factor, S 2/r (where S is the Seebeck coefficient and r is the electrical resistivity) was observed in Fe-rich Fe2.1V0.91Al0.99 compound at a pressure about ∼1 GPa. It was found that all alloys with weak deviation from stoichiometric composition had a feature in their S (P) pressure behavior at P∼2 GPa which could be related to semimetal-metal phase transition.
{"title":"Nonstoichiometric Fe–V–Al full Heusler alloys under high pressure: thermoelectric properties","authors":"I. Korobeynikov, A. Y. Usik, T. E. Govorkova, S. Emelyanova, V. Marchenkov","doi":"10.1080/08957959.2021.1924702","DOIUrl":"https://doi.org/10.1080/08957959.2021.1924702","url":null,"abstract":"ABSTRACT The Heusler alloys are promising material for various applications, including thermoelectric power generators. There are several ways to improve their properties, among which the substitution of constituent elements, nanostructuring, temperature treatment, thin films engineering etc. This work is devoted to the experimental study of thermoelectric properties of Fe–V–Al-based Heusler alloys with different compositions under high pressure. The Seebeck coefficient and electrical resistance of several compounds were measured as a function of applied pressure up to 10 GPa at room temperature. The experimental results demonstrated a diversity of pressure responses of the thermoelectric properties that can be observed in chemically similar Heusler alloys under variation in their compositions. Moderate enhancing of the thermoelectric power factor, S 2/r (where S is the Seebeck coefficient and r is the electrical resistivity) was observed in Fe-rich Fe2.1V0.91Al0.99 compound at a pressure about ∼1 GPa. It was found that all alloys with weak deviation from stoichiometric composition had a feature in their S (P) pressure behavior at P∼2 GPa which could be related to semimetal-metal phase transition.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"184 - 197"},"PeriodicalIF":2.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1924702","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44458030","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 : 2021-03-24DOI: 10.1080/08957959.2021.1903457
K. Takemura
ABSTRACT The characteristics of hydrostatic stress conditions are discussed and compared with real experimental observations made under high pressure with a diamond-anvil cell. While fluid pressure-transmitting media give a well-defined single stress condition, solid pressure-transmitting media give a variety of stress conditions within the limit of their shear strength under high pressure. Owing to its low shear strength, solid helium would be the best choice for a pressure-transmitting medium to at least 100 GPa. However, helium is so compressible that care should be taken on minimizing irregular deformation of a gasket hole, which often causes complicated stress states. A review is given on the quasi-hydrostatic limits of solidified pressure-transmitting media, and some ways to reduce nonhydrostaticity are discussed including the case of low-temperature experiments.
{"title":"Hydrostaticity in high pressure experiments: some general observations and guidelines for high pressure experimenters","authors":"K. Takemura","doi":"10.1080/08957959.2021.1903457","DOIUrl":"https://doi.org/10.1080/08957959.2021.1903457","url":null,"abstract":"ABSTRACT The characteristics of hydrostatic stress conditions are discussed and compared with real experimental observations made under high pressure with a diamond-anvil cell. While fluid pressure-transmitting media give a well-defined single stress condition, solid pressure-transmitting media give a variety of stress conditions within the limit of their shear strength under high pressure. Owing to its low shear strength, solid helium would be the best choice for a pressure-transmitting medium to at least 100 GPa. However, helium is so compressible that care should be taken on minimizing irregular deformation of a gasket hole, which often causes complicated stress states. A review is given on the quasi-hydrostatic limits of solidified pressure-transmitting media, and some ways to reduce nonhydrostaticity are discussed including the case of low-temperature experiments.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":"41 1","pages":"155 - 174"},"PeriodicalIF":2.0,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/08957959.2021.1903457","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44784275","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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