Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen

Video in TIB AV-Portal: Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen

Formal Metadata

Kristallumwandlung - Lamellenstrukturen beim Verdampfen von Kaliumchlorid-Einkristallflächen
Alternative Title
Transformation of Crystals - Lamellar Structures during Evaporation on Potassium Chloride Single Crystal Surfaces
Pick, Heinz
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.
IWF Signature
E 2567
Release Date
Silent film
Heinz Pick
Production Year

Technical Metadata

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

Content Metadata

Subject Area
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
Verdampfung Minute
Temperature Minute
Temperature Minute
Bearbeitung Institut für Theoretische Physik Tübingen


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