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Nonstoichiometry in steps on AB crystals (I). General aspects, including bulk imperfections
Author(s) -
Arnold H.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170241003
Subject(s) - stoichiometry , connection (principal bundle) , gas phase , simple (philosophy) , phase (matter) , composition (language) , thermodynamics , chemistry , chemical physics , materials science , crystallography , physics , mathematics , geometry , philosophy , linguistics , organic chemistry , epistemology
Starting with a quasichemical treatment, simple model calculations are given for the equilibrium composition in surface steps containing A and B kinks, the amount and ratio of which is varied by changing the adjacent gas composition. In connection with deviations from step stoichiometry, the total amount of kinks increases strongly. A nearest neighbour approximation has been applied to the attachment of A or B atoms at kinks from the gas phase, and also from the bulk by formation of vacancies V A or V B . These processes can be formulated separately for the two elements, taking into account the effective formation of bulk atoms of the other kind (B B or B A ).