ИССЛЕДОВАНИЕ СТРУКТУРНЫХ ОСОБЕННОСТЕЙ КРИСТАЛЛОВ LiNbO3:Y(0,24):Mg(0,63 мас. %), LiNbO3:Y(0,46 мас. %), LiNbO3:Mg(0,5 мас. %) ПО ИК-СПЕКТРАМ ПОГЛОЩЕНИЯ В ОБЛАСТИ ВАЛЕНТНЫХ КОЛЕБАНИЙ ОН-ГРУПП

Abstract

Single crystals LiNbO3:Y(0.24):Mg:(0.63 wt. %), LiNbO3:Mg(0.5 wt. %), LiNbO3:Y(0.46 wt. %) were studied by infrared absorption spectroscopy in the area of valence vibrations of OH-groups. The absorption bands in the frequency range 3465–3488 cm–1 associated with the violation of stoichiometry in the crystal due to sharpened defects (VLi, NbLi) and formed complex defects VLi-ОН, NbLi-ОН. A part of Y3+ cations forms complex defects -ОН, -ОН- , which correspond to the absorption bands 3527, 3535 cm–1 in crystal LiNbO3:Y (0.46 wt. %). The introduction of magnesium alloying impurity into the double-doped crystal increases the effective distribution coefficient of the rare-earth impurity in the crystal and increases the luminescence of rare-earth ions by 8 times.