Abstract
The existence of protons (H + ) was characterized by infrared absorption spectroscopy in potassium lithium niobate single crystals with a lower than 1.5 Li content. The as-grown crystals showed a broad OH stretching vibration near 3500 cm -1 and contained about 5.5 × 10 18 cm -3 protons. Especially, the concentration of the protons increased about one order of the magnitude after heat treatment in a humid atmosphere. From the measurements of the polarization dependence of the OH - absorption bands in this crystal, we can expect that the OH - ions vibrate along the c-axis and O-O edges of an oxygen octahedron. It shows a different aspect in comparison with LiNbO 3 single crystals due to the different structure and the cation environment.
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