Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online]
dc.contributor.author | Dogel, Stanislav | * |
dc.date.accessioned | 2021-02-12T04:15:50Z | |
dc.date.available | 2021-02-12T04:15:50Z | |
dc.date.issued | 2004 | * |
dc.date.submitted | 2019-07-30 20:01:59 | * |
dc.identifier | 34976 | * |
dc.identifier.uri | https://directory.doabooks.org/handle/20.500.12854/59831 | |
dc.description.abstract | 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. | * |
dc.language | English | * |
dc.subject | QD1-999 | * |
dc.subject.classification | thema EDItEUR::P Mathematics and Science::PN Chemistry | en_US |
dc.subject.other | molten salt | * |
dc.subject.other | surface phase transition | * |
dc.subject.other | spectroscopic ellipsometry | * |
dc.subject.other | Ga-Bi alloys | * |
dc.title | Spectroscopic ellipsometry of interfacial phase transitions in fluid metallic systems: KxKCl1-x and Ga1-xBix [online] | * |
dc.type | book | |
oapen.identifier.doi | 10.5445/KSP/812004 | * |
oapen.relation.isPublishedBy | 68fffc18-8f7b-44fa-ac7e-0b7d7d979bd2 | * |
oapen.relation.isbn | 3937300082 | * |
peerreview.review.type | Full text | |
peerreview.anonymity | All identities known | |
peerreview.reviewer.type | Internal editor | |
peerreview.reviewer.type | External peer reviewer | |
peerreview.review.stage | Pre-publication | |
peerreview.open.review | No | |
peerreview.publish.responsibility | Scientific or Editorial Board | |
peerreview.id | 8ad5c235-9810-49eb-b358-27c8675324d9 | |
peerreview.title | Dissertations (Dissertationen) |
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