Infrared study of KTiOPO4 single crystals hydrothermally grown in H2O and D2O solutions

Abstract

A detailed infrared study has identified the spectral features of potassium titanate orthophosphate, KTiOPO4 (KTP), between 4000 and 2200 cm−1. KTP single crystals grown by hydrothermal and flux methods were examined. By using ordinary and heavy water in separate runs to grow KTP crystals hydrothermally, features that depend on the presence of H2O or D2O in the growth process have been distinguished from features that do not. The effect of multiple OH sites in KTP has been linked with crystal quality and specific trace impurities, e.g., Fe+3.