A study of the internal structure of variety III diamonds by X-ray section topography |
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| Authors: | Yu L Orlov N A Bulienkov V P Martovitsky |
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| Institution: | 1. The Fersman Mineralogical Museum of the USSR Academy of Sciences, Leninsky prosp. 18, Moscow, USSR
2. Lebedev Physical Institute, the USSR Academy of Sciences, Leninsky prosp. 53, Moscow, USSR
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| Abstract: | The internal structure of variety III diamonds (Orlov 1977) was examined by X-ray section topography. The crystal space was found to be divided into six cubic sectors of a face-form of rhombododecahedroid variety III (Shafranovsky 1961). The defect lines on the topographs are the traces of {110} defect planes. It is concluded that separate 〈111〉 fibres are grouped into {110} layers (lamellae). The internal structure of the crystals is characterized by continuous warping of crystal planes and is directly connected with {110} defect planes which are tilt boundaries. Examples of variants of filling cubic sectors are given and their connection with misorientation shown on topographs demonstrated. The characteristic internal structure of variety III diamonds can account for their morphological features and structure-dependent properties; for examples, the cleavage on {110} and {100}. |
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