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Étude de l'origine de cavités polyédriques dans des cristaux d'oxyde de nickel et de leur evolution morphologique au cours de traitements thermiques

Authors
Journal
Journal of Crystal Growth
0022-0248
Publisher
Elsevier
Publication Date
Volume
56
Issue
1
Identifiers
DOI: 10.1016/0022-0248(82)90016-1
Disciplines
  • Mathematics

Abstract

Abstract The content of microscopic polyhedral cavities observed NiO crystals grown by both the flame fusion and floating zone techniques was analysed, and their geometrical evolution upon high temperature thermal treatment studied in order to determine their origin and characteristics. The gas content of these defects (both oxygen and nitrogen) indicates that they originate from shrinkage cavities. The morphological evolution of the cavities towards tetrakaidecahedra, the surface of which is essentially made of {111} planes, indicates a high stability of these faces due to a strong adsorption of N 2 (and/or O 2).

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