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— Using IR absorption spectroscopy in the stretching region of OH groups and Raman spectroscopy in the region of two-particle states of acoustic phonons, we have demonstrated that high-temperature top-seeded solution growth from a melt of congruent composition containing 6.0 wt % K2O flux in Kristall-2 commercially available growth units makes it possible to obtain nearly stoichiometric LiNbO3 crystals...
— Nominally undoped and doped LiNbO3 crystals have been studied using full-profile analysis of X‑ray diffraction data and Raman spectroscopy. The X-ray diffraction patterns and Raman spectra of the crystals contain weak superstructure lines forbidden for space group R3c. The observed superstructure lines are not reflections from a second phase. The intensity distribution and position of the additional...
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