| Autor: |
I. Blech, S. Mardix, A. R. Lang |
| Rok vydání: |
1971 |
| Předmět: |
|
| Zdroj: |
Philosophical Magazine. 24:683-693 |
| ISSN: |
0031-8086 |
| DOI: |
10.1080/14786437108217039 |
| Popis: |
Vapour-grown platelet crystals of ZnS containing long-period polytypes have been found by x-ray topography to contain a single screw dislocation with a very large Burgers vector parallel to the c axis. Individual polytype regions can have highly perfect lattices; the few dislocations observed in them in addition to the giant screw have Burgers vectors in the basal plane. A divergent-beam section topograph arrangement has been used to measure giant Burgers vectors to an accuracy of about 30%. Within this uncertainty, the Burgers vector magnitudes match the polytype repeat period in the five crystals upon which measurements have been made, the repeat periods ranging from 50 A to 106 A. The x-ray topographic studies provide good evidence in support of the periodic slip process for polytype formation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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