Structures of impurity defects in KDP and their influence on the quality of crystals

Авторы: Eremina T.A., Kuznetsov V.A., Okhrimenko T.M., Rak M.
Сборник: Proceedings of SPIE - The International Society for Optical Engineering
Год издания: 2003
Первая страница: 153
Последняя страница: 158
DOI: 10.1117/12.518834
Аннотация: On the basis of crystal chemical analysis and modeling KDP structure, the mechanism of incorporation of bivalent ions (Ni2+, Co2+, Fe2+, Mn2+) of radii 0.75 Å < r < 1.1 Å and trivalent ions (Al3+, Fe3+, Mn3+, Y3+, La3+) in KDP crystals is analyzed. For the considered bivalent (Me2+) and trivalent (Me3+) impurity ions, formation of two types of defect centers is revealed: isolated centers formed by trivalent impurity ions and Ni2+ ions; chains of bivalent impurity ions, oriented at an angle of 60° - 70° or even more to the [001] direction. The formation energy of Me2+ centers is much greater than that of Me3+ centers. This fact and crystal chemical analysis of structure deformations confirm stronger lattice strains generated by Me2+ ions in KDP structure. The different influence of Me2+ and Me3+ ions on surface morphology of KDP faces is presented. The effect of Me3+ ions is supposed to be due to the adsorption while the influence of Me2+ ions depend mainly on their incorporation in crystal structure (structural mechanism of impurity influence).
Добавил в систему: Еремин Николай Николаевич

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