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Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen

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Formal Metadata

Title Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen
Alternative Title Transformation of Crystals - Lamellar Structures during Evaporation on Potassium Chloride Single Crystal Surfaces
Author Pick, Heinz
License No Open Access License:
German copyright law applies. This film may be used for your own use but it may not be distributed via the internet or passed on to external parties.
DOI 10.3203/IWF/E-2567
IWF Signature E 2567
Publisher IWF (Göttingen)
Release Date 1983
Language Silent film
Producer Heinz Pick
Production Year 1953

Technical Metadata

IWF Technical Data Film, 16 mm, LT, 66 m ; SW, 6 min

Content Metadata

Subject Area Physics
Abstract Die Vorgeschichte eines Kaliumchlorid-Einkristalls wird besonders deutlich an den Spaltflächen beim Verdampfen unterhalb des Schmelzpunktes. Innerhalb engbegrenzter Temperaturbereiche bilden sich 1. rechtwinkelige Lamellenstrukturen (unterhalb 720°C), 2. Übergangsstrukturen (720-740°C) und 3. kreisförmige Lamellenstrukturen (740-770°C). Zeitrafferaufnahmen im Phasenkontrastmikroskop.
The thermal history of a crystal plays a very important part in the visual and electrical examination of alkali halides. For this reason, crystal surfaces are examined at high temperatures. During evaporation in air the fracture planes show characteristic changes. Thus, below the melting point of 770°C, various surface structures are observed. Rectangular lamella structures form within narrowly defined temperature ranges below 720°C. Between 720°C and 740°C intermediate structures occur and circular lamella structures appear between 740°C and 770°C. The observations were carried out with the aid of a phase contrast microscope. The micro-cinematographic exposures were made using time lapse photography with ratios of 3:1 to 144:1.
Keywords Übergangsstruktur
Einkristall / Kaliumchlorid
KCl
Kaliumchlorideinkristall (KCI)
Verdampfung
Lamellenstruktur
Kristallverformung / Kaliumchlorid
crystal deformation / potassium chloride
lamellar structure
evaporation
potassium chloride single crystal
KCl
mono crystal / potassium chloride
intermediate structure
transition structure
Annotations
Transcript
Verdampfung
Microscopy
Minute
Temperature
Microscopy
Minute
Computer animation
Temperature
Microscopy
Minute
Computer animation
Microscopy
Computer animation
Bearbeitung
Institut für Theoretische Physik Tübingen
Microscopy
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AV-Portal 3.8.0 (dec2fe8b0ce2e718d55d6f23ab68f0b2424a1f3f)