Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online]
The investigation of the interfacial phase transitions in fluid systems with short-range intermetallic interactions are of great interest. The phenomena were studied in two systems exhibiting a liquid-liquid miscibility gap: at the fluid/wall interface in fluid KxKCl1-x and at the fluid/vacuum inter...
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| Formato: | Online |
| Idioma: | inglês |
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KIT Scientific Publishing
2021
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| _version_ | 1869516069396283392 |
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| author | Dogel, Stanislav |
| author_browse | Dogel, Stanislav |
| author_facet | Dogel, Stanislav |
| author_sort | Dogel, Stanislav |
| collection | Directory of Open Access Books |
| description | The investigation of the interfacial phase transitions in fluid systems with short-range intermetallic interactions are of great interest. The phenomena were studied in two systems exhibiting a liquid-liquid miscibility gap: at the fluid/wall interface in fluid KxKCl1-x and at the fluid/vacuum interface of the Ga1 xBix alloys. To characterize the interfacial changes of the ultra thin films (composition, thickness and their evolution with time) the spectroscopic ellipsometry was performed over a wide spectral range. Whereas in the experiments on KxKCl1-x an existing ellipsometer could be used, a completely new UHV-apparatus including the in-situ phase modulation ellipsometer had to be developed for Ga1 xBix alloys. For the KxKCl1-x system new results on complete wetting at solid-liquid coexistence as well as in the homogenous liquid phase (prewetting) are presented. The spectra show the typical F center absorption which indicates that the film is a salt-rich phase. The thickness strongly increases approaching the monotectic from 30 to 440 nm, which is in agreement with the tetra point wetting scenario. For this interpretation a quantitative description of the excess Gibbs energy has been developed. For the Ga1 xBix system the results on complete wetting, surface freezing and oscillatory interfacial instabilities are presented. The high-precision spectra have been recorded approaching the liquid-liquid miscibility. These spectra have been modeled using a Ga-Bi effective medium approximation for the substrate covered by a film of liquid Bi. The measurements give evidence of tetra point wetting in the Ga-Bi system. First ellipsometric study of the surface freezing in Ga-Bi has been performed. Within the miscibility gap a very interesting effect of surface and bulk oscillatory instability was observed. The details of this process at present are not well understood, but a qualitative description is given. |
| format | Online |
| id | doab-20.500.12854ir-59831 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | KIT Scientific Publishing |
| publisherStr | KIT Scientific Publishing |
| record_format | ojs |
| spelling | doab-20.500.12854ir-598312024-04-05T12:38:51Z Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] Dogel, Stanislav QD1-999 molten salt surface phase transition spectroscopic ellipsometry Ga-Bi alloys thema EDItEUR::P Mathematics and Science::PN Chemistry The investigation of the interfacial phase transitions in fluid systems with short-range intermetallic interactions are of great interest. The phenomena were studied in two systems exhibiting a liquid-liquid miscibility gap: at the fluid/wall interface in fluid KxKCl1-x and at the fluid/vacuum interface of the Ga1 xBix alloys. To characterize the interfacial changes of the ultra thin films (composition, thickness and their evolution with time) the spectroscopic ellipsometry was performed over a wide spectral range. Whereas in the experiments on KxKCl1-x an existing ellipsometer could be used, a completely new UHV-apparatus including the in-situ phase modulation ellipsometer had to be developed for Ga1 xBix alloys. For the KxKCl1-x system new results on complete wetting at solid-liquid coexistence as well as in the homogenous liquid phase (prewetting) are presented. The spectra show the typical F center absorption which indicates that the film is a salt-rich phase. The thickness strongly increases approaching the monotectic from 30 to 440 nm, which is in agreement with the tetra point wetting scenario. For this interpretation a quantitative description of the excess Gibbs energy has been developed. For the Ga1 xBix system the results on complete wetting, surface freezing and oscillatory interfacial instabilities are presented. The high-precision spectra have been recorded approaching the liquid-liquid miscibility. These spectra have been modeled using a Ga-Bi effective medium approximation for the substrate covered by a film of liquid Bi. The measurements give evidence of tetra point wetting in the Ga-Bi system. First ellipsometric study of the surface freezing in Ga-Bi has been performed. Within the miscibility gap a very interesting effect of surface and bulk oscillatory instability was observed. The details of this process at present are not well understood, but a qualitative description is given. 2021-02-12T04:15:50Z 2021-02-12T04:15:50Z 2019-07-30 20:01:59 2004 book 34976 3937300082 https://directory.doabooks.org/handle/20.500.12854/59831 eng image/jpeg https://www.ksp.kit.edu/3937300082 KIT Scientific Publishing 10.5445/KSP/812004 10.5445/KSP/812004 68fffc18-8f7b-44fa-ac7e-0b7d7d979bd2 3937300082 open access |
| spellingShingle | QD1-999 molten salt surface phase transition spectroscopic ellipsometry Ga-Bi alloys thema EDItEUR::P Mathematics and Science::PN Chemistry Dogel, Stanislav Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title_full | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title_fullStr | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title_full_unstemmed | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title_short | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] |
| title_sort | spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems kxkcl1 x and ga1 xbix online |
| topic | QD1-999 molten salt surface phase transition spectroscopic ellipsometry Ga-Bi alloys thema EDItEUR::P Mathematics and Science::PN Chemistry |
| topic_facet | QD1-999 molten salt surface phase transition spectroscopic ellipsometry Ga-Bi alloys thema EDItEUR::P Mathematics and Science::PN Chemistry |
| url | 34976 |
| work_keys_str_mv | AT dogelstanislav spectroscopicellipsometryofinterfacialphasetransitionsinfluidmetallicsystemskxkcl1xandga1xbixonline |