Structure and properties of antimony-doped potassium titanyl phosphate single crystals
Structure and properties of antimony-doped potassium titanyl phosphate single crystals
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DOI：
10.1134/1.1996729
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发表时间：
2005-07
影响因子：
0.7
通讯作者：
O. Alekseeva;O. D. Krotova;N. Sorokina;I. Verin;T. Losevskaya;V. Voronkova;V. K. Yanovskiǐ;V. Simonov
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文献类型：
--
作者：
O. Alekseeva;O. D. Krotova;N. Sorokina;I. Verin;T. Losevskaya;V. Voronkova;V. K. Yanovskiǐ;V. Simonov
用X射线衍射分析研究了掺锑磷酸钛氧钾（KTP）晶体的组成KTiOPO 4。结果表明，随着KTP晶体中锑含量的增加，钾原子的占位位置发生变化，并产生新的附加位置。额外的空位的形成和钾离子位置的分裂解释了铁电相变温度的显著降低、弛豫现象的增强以及锑掺杂KTP晶体电导率的增加。锑原子取代钛是伴随着延长短和缩短长Ti-O键的TiO 6八面体，在激光照射的KTP晶体的二次谐波产生的强度较低的结果的过程。
Antimony-doped potassium titanyl phosphate (KTP) crystals of the composition KTiOPO4are 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 TiO6octahedra, processes which result in lower intensity of second-harmonic generation in laser-irradiated KTP crystals.