Viskosimetrische Untersuchungen zum Schmelzprozeß von Metallen am Beispiel des Galliums und der intermetallischen Verbindung Hg5Tl2 Article Swipe
YOU?
·
· 1968
· Open Access
·
· DOI: https://doi.org/10.1515/zna-1968-1226
Zur viskosimetrischen Verfolgung des Schmelzvorganges von Metallen wurde ein Schwingtiegelviskosimeter konstruiert, das es gestattet, die Viskosität von Schmelzen, die frisch aus dem Festkörper entstanden sind, rasch und präzise zu messen. An hochreinem Gallium konnte ein viskosimetrischer Nachschmelzeffekt festgestellt werden, der darin besteht, daß die Viskosität der unmittelbar aus dem Kristall entstandenen Schmelze anomal hoch ist und innerehalb von etwa 1 min auf den üblichen Viskositätswert der Gleichgewichtsschmelze abfällt. Das Abklingen der überschüssigen Viskosität ist irreversibel. Beim Abkühlen des flüssigen Galliums bis unter seinen Schmelzpunkt tritt kein anomaler Anstieg der Viskosität ein. In ähnlicher Weise ist auch das Schmelzverhalten der Verbindung Hg 5 Tl 2 untersucht worden. Hier tritt kein Nachschmelzeffekt auf. Das unterschiedliche Verhalten der beiden untersuchten Substanzen ist auf die individuellen Änderungen der Bindungs- und Strukturverhältnisse beim Übergang fest—flüssig zurückzuführen. Beim Gallium treten am Schmelzpunkt unmittelbar nach der Auflösung des Gitters offenbar größere, nicht im Gleichgewicht befindliche Agglomerate auf. Erst nach deren Dissoziation ist die Gleichgewichtsstruktur der Schmelze erreicht. Unter idealisierenden Annahmen kann aus der Viskositätsüberhöhung beim Nachschmelzeffekt ein Clusteranteil an der Gesamtschmelze von größenordnungsmäßig 10% abgeschätzt werden.
Related Topics
- Type
- article
- Language
- de
- Landing Page
- https://doi.org/10.1515/zna-1968-1226
- https://www.degruyter.com/document/doi/10.1515/zna-1968-1226/pdf
- OA Status
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- Cited By
- 9
- Related Works
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- OpenAlex ID
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Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2144586390Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1515/zna-1968-1226Digital Object Identifier
- Title
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Viskosimetrische Untersuchungen zum Schmelzprozeß von Metallen am Beispiel des Galliums und der intermetallischen Verbindung Hg5Tl2Work title
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articleOpenAlex work type
- Language
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dePrimary language
- Publication year
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1968Year of publication
- Publication date
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1968-12-01Full publication date if available
- Authors
-
B. Predel, I. ArpshofenList of authors in order
- Landing page
-
https://doi.org/10.1515/zna-1968-1226Publisher landing page
- PDF URL
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https://www.degruyter.com/document/doi/10.1515/zna-1968-1226/pdfDirect link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
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https://www.degruyter.com/document/doi/10.1515/zna-1968-1226/pdfDirect OA link when available
- Concepts
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ChemistryTop concepts (fields/topics) attached by OpenAlex
- Cited by
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9Total citation count in OpenAlex
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2018: 1Per-year citation counts (last 5 years)
- Related works (count)
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10Other works algorithmically related by OpenAlex
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