Structure and properties of antimony-doped potassium titanyl phosphate single crystals

Antimony-doped potassium titanyl phosphate (KTP) crystals of the composition KTiOPO{sub 4} are studied by X-ray diffraction analysis. It is shown that, with an increase of antimony content in KTP crystals, the occupancies of potassium positions change and new additional positions for potassium atoms...

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Bibliographic Details
Published in:Crystallography reports 2005-07, Vol.50 (4), p.554-565
Main Authors: Alekseeva, O. A., Krotova, O. D., Sorokina, N. I., Verin, I. A., Losevskaya, T. Yu, Voronkova, V. I., Yanovskii, V. K., Simonov, V. I.
Format: Article
Language:English
Subjects:
ANTIMONY
BOND LENGTHS
CATIONS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELONGATION
FERROELECTRIC MATERIALS
HARMONIC GENERATION
LASERS
MATERIALS SCIENCE
MONOCRYSTALS
PHASE TRANSFORMATIONS
PHOSPHATES
POTASSIUM COMPOUNDS
RELAXATION
TITANIUM COMPOUNDS
VACANCIES
X-RAY DIFFRACTION
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Summary:Antimony-doped potassium titanyl phosphate (KTP) crystals of the composition KTiOPO{sub 4} are studied by X-ray diffraction analysis. It is shown that, with an increase of antimony content in KTP crystals, the occupancies of potassium positions change and new additional positions for potassium atoms arise. The formation of additional vacancies and splitting of the potassium-cation positions explain the considerable decrease in the temperature of the ferroelectric phase transition, enhancement of the relaxation phenomena, and an increase in electric conductivity of antimony-doped KTP crystals. Substitution of antimony atoms for titanium is accompanied by elongation of short and shortening of long Ti-O bonds in the TiO{sub 6} octahedra, processes which result in lower intensity of second-harmonic generation in laser-irradiated KTP crystals.
ISSN:1063-7745
1562-689X
DOI:10.1134/1.1996729