On the role of intrinsic clusters in damage-resistant LiNbO3

Autor(en): Wohlecke, M
Volk, T
Donnerberg, H
Stichwörter: COMPUTER-SIMULATION; CRYSTALS; DEFECT STRUCTURE; LITHIUM-NIOBATE; MGO-DOPED LINBO3; Physics; Physics, Condensed Matter
Erscheinungsdatum: 1997
Herausgeber: TAYLOR & FRANCIS LTD
Journal: FERROELECTRICS LETTERS SECTION
Volumen: 22
Ausgabe: 3-4
Startseite: 53
Seitenende: 58
Zusammenfassung: 
The intrinsic stoichiometry-related defect structure of LiNbO3 consists of Nb antisites and of charge compensating cation vacancies. The electrooptic properties of the material are mainly determined by the concentration of Nb antisites acting as important electron traps. Recent atomistic computer simulations suggested the agglomeration of Nb antisites and cation vacancies probably resulting in spacious intrinsic defect clusters. Since the incorporation of divalent impurity cations consumes stoichiometry-related defects, possible clustering effects should be observable as peculiarities in the antisite concentration dependence of physical properties. It is the purpose of this letter to relate corresponding non-linearities to the existing intrinsic defect clusters. The non-linearities, which are observed well below the threshold concentrations of divalent impurity cations, cannot be understood on the basis of isolated stoichiometry-related defects.
ISSN: 07315171

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