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X‐ray diffraction topography study of defects in potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP) single crystals
Author(s) -
Lutsau V. G.,
Fishman Ju. M.,
Res I. S.
Publication year - 1970
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19700050310
Subject(s) - diffraction , dislocation , impurity , crystallography , materials science , ammonium dihydrogen phosphate , crystal (programming language) , lattice (music) , burgers vector , condensed matter physics , optics , chemistry , physics , fertilizer , programming language , organic chemistry , computer science , acoustics
The direct observation of dislocations in KH 2 PO 4 (KDP) and NH 4 H 2 PO 4 (ADP) single crystals has been performed by X‐ray diffraction topography methods. Crystals were grown by slow cooling of stirred solutions on different types of seed crystals. It is demonstrated that the main sources of dislocation generation are the seed surface, inclusions of mother liquor and foreign particles. Space orientation of dislocations and their Burgers vector directions are found. In regions far from the seed the dislocation density did not exceed 10 3 cm −2 and a number of specimens with cross‐sectional areas up to several cm 2 were free from dislocations. Dynamical phenomena characteristic of the diffraction in a weakly deformed lattice have been observed over a wide range of μ t at the boundaries between the {101} and {100} growth sectors having different impurity contents. Several crystals show also nonuniform impurity distribution in the form ot the layers parallel to growing face (growth layers).