Incorporation of hafnium (IV) into KTP framework from phosphate‐fluoride fluxes

Solid solutions KTi 1‐X Hf X OPO 4 (х = 0.008 – 0.107) possessing the KTiOPO 4 structure, have been synthesized in molten system K 2 O‐P 2 O 5 ‐TiO 2 ‐HfF 4 . The crystal growth experiment of Hf‐doped KTP crystal has been reported. The X‐ray powder diffraction data and chemical analysis are also presented. It has been shown that KTiOPO 4 crystal structure slightly changes when Hf incorporates into the framework. Transmission/absorption spectra of KTi 0.974 Hf 0.026 OPO 4 crystals have been recorded. The incorporation of Hf ions shifts the optical absorption edge in the UV‐visible spectrum towards the long‐wavelength region with absorption near 387 nm.