The origin of reported twin domains of LiGeBO₄ was investigated by methods of thermal analysis. The twins were found to result from a phase transition which occurs 2-3 K below the peritectic decomposition of the compound. Large single crystals of LiGeBO₄ were grown by an improved growth method using the top-seeding technique. Linear optical properties (refractive indices between 404 nm and 2325 nm and unpolarized absorption spectrum) as a basis for nonlinear optical investigations were determined. Unfortunately, LiGeBO₄ is not phase matchable.

Keywords: Lithium germanate borate, LiGeBO4, optical properties, thermal properties

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