{"title":"Sound velocity and elastic properties of Fe–Ni–S–Si liquid: the effects of pressure and multiple light elements","authors":"Iori Yamada, Hidenori Terasaki, Satoru Urakawa, Tadashi Kondo, Akihiko Machida, Yoshinori Tange, Yuji Higo","doi":"10.1007/s00269-023-01243-8","DOIUrl":null,"url":null,"abstract":"<div><p>Fe–Ni–S–Si alloy is considered to be one of the plausible candidates of Mercury core material. Elastic properties of Fe–Ni–S–Si liquid are important to reveal the density profile of the Mercury core. In this study, we measured the P-wave velocity (<i>V</i><sub><i>P</i></sub>) of Fe–Ni–S–Si (Fe<sub>73</sub>Ni<sub>10</sub>S<sub>10</sub>Si<sub>7</sub>, Fe<sub>72</sub>Ni<sub>10</sub>S<sub>5</sub>Si<sub>13</sub>, and Fe<sub>67</sub>Ni<sub>10</sub>S<sub>10</sub>Si<sub>13</sub>) liquids up to 17 GPa and 2000 K to study the effects of pressure, temperature, and multiple light elements (S and Si) on the <i>V</i><sub><i>P</i></sub> and elastic properties.</p><p>The <i>V</i><sub><i>P</i></sub> of Fe–Ni–S–Si liquids are less sensitive to temperature. The effect of pressure on the <i>V</i><sub><i>P</i></sub> are close to that of liquid Fe and smaller than those of Fe–Ni–S and Fe–Ni–Si liquids. Obtained elastic properties are <i>K</i><sub><i>S0</i></sub> = 99.1(9.4) GPa, <i>K</i><sub><i>S</i></sub><i>’</i> = 3.8(0.1) and <i>ρ</i><sub><i>0</i></sub> =6.48 g/cm<sup>3</sup> for S-rich Fe<sub>73</sub>Ni<sub>10</sub>S<sub>10</sub>Si<sub>7</sub> liquid and <i>K</i><sub><i>S0</i></sub> = 112.1(1.5) GPa, <i>K</i><sub><i>S</i></sub>’ = 4.0(0.1) and <i>ρ</i><sub><i>0</i></sub>=6.64 g/cm<sup>3</sup> for Si-rich Fe<sub>72</sub>Ni<sub>10</sub>S<sub>5</sub>Si<sub>13</sub> liquid. The <i>V</i><sub><i>P</i></sub> of Fe–Ni–S–Si liquids locate in between those of Fe–Ni–S and Fe–Ni–Si liquids. This suggests that the effect of multiple light element (S and Si) on the <i>V</i><sub><i>P</i></sub> is suppressed and cancel out the effects of single light elements (S and Si) on the <i>V</i><sub><i>P</i></sub>. The effect of composition on the EOS in the Fe–Ni–S–Si system is indispensable to estimate the core composition combined with the geodesy data of upcoming Mercury mission.</p></div>","PeriodicalId":20132,"journal":{"name":"Physics and Chemistry of Minerals","volume":"50 3","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00269-023-01243-8.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics and Chemistry of Minerals","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s00269-023-01243-8","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Fe–Ni–S–Si alloy is considered to be one of the plausible candidates of Mercury core material. Elastic properties of Fe–Ni–S–Si liquid are important to reveal the density profile of the Mercury core. In this study, we measured the P-wave velocity (VP) of Fe–Ni–S–Si (Fe73Ni10S10Si7, Fe72Ni10S5Si13, and Fe67Ni10S10Si13) liquids up to 17 GPa and 2000 K to study the effects of pressure, temperature, and multiple light elements (S and Si) on the VP and elastic properties.
The VP of Fe–Ni–S–Si liquids are less sensitive to temperature. The effect of pressure on the VP are close to that of liquid Fe and smaller than those of Fe–Ni–S and Fe–Ni–Si liquids. Obtained elastic properties are KS0 = 99.1(9.4) GPa, KS’ = 3.8(0.1) and ρ0 =6.48 g/cm3 for S-rich Fe73Ni10S10Si7 liquid and KS0 = 112.1(1.5) GPa, KS’ = 4.0(0.1) and ρ0=6.64 g/cm3 for Si-rich Fe72Ni10S5Si13 liquid. The VP of Fe–Ni–S–Si liquids locate in between those of Fe–Ni–S and Fe–Ni–Si liquids. This suggests that the effect of multiple light element (S and Si) on the VP is suppressed and cancel out the effects of single light elements (S and Si) on the VP. The effect of composition on the EOS in the Fe–Ni–S–Si system is indispensable to estimate the core composition combined with the geodesy data of upcoming Mercury mission.
期刊介绍:
Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are:
-Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.)
-General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.)
-Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.)
-Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.)
-Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems
-Electron microscopy in support of physical and chemical studies
-Computational methods in the study of the structure and properties of minerals
-Mineral surfaces (experimental methods, structure and properties)