The effect of magnesium impurities on the optical and spectral characteristics of calcium orthovanadate single crystals doped with chromium and manganese

• Published in: Journal of crystal growth 2024-12, Vol.648, p.127908, Article 127908
• Main Authors: Voronina, I.S., Doroshenko, M.E., Dunaeva, E.E., Zykova, S.S., Iskhakova, L.D., Ivleva, L.I.
• Format: Article
• Language: English
• Subjects: A1. optical properties; A1. real structure; A2. calcium orthovanadate; A2. Czochralski growth; B1. magnesium ions; B1. transition metals ions
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2024.127908

•Ca3(VO4)2:Mn:Mg and Ca3(VO4)2:Cr:Mg single crystals were studied for the first time.•Spectral properties of Mg co-doped crystals were first time determined.•Co-doped crystals demonstrate significant modifications of optical absorption spectra.•When annealed, co-doped crystals show slowdown of TM ions valence state reduction. The effect of magnesium co-doping on growth conditions, crystal composition, optical and spectral properties of manganese or chromium-doped Ca3(VO4)2 (CVO) crystal was studied. The single crystals were grown by the Czochralski method. Effective segregation coefficients of manganese and chromium in the CVO matrix with magnesium co-doping were calculated. A redistribution of the absorption lines intensities was observed in the absorption spectra of CVO:Mn:Mg and CVO:Cr:Mg. Low (15 K) temperature fluorescence measurements confirmed that co-doping CVO crystal with Mg ions leads to the redistribution of Mn ions concentration in different valence states, but does not cause changes in their spectral properties. In the presence of magnesium, additional annealing of the materials resulted in a slower reduction of the valence state of doping ions and a noticeable change in crystal coloration. All investigated impurities have practically no effect on the specific ferroelectric domain structure of CVO.