Preparation and structural investigations of sol–gel derived image-doped image Original Research Article

Monoclinic and hexagonal undoped and Eu3+Eu3+-doped calcium aluminates (CaAl2O4)(CaAl2O4) were prepared as powders using sol–gel methodology after thermal treatments at View the MathML source850∘C (hexagonal form) or View the MathML source1200∘C (monoclinic form). Attempt was made to solve the unknown structure of the metastable hexagonal form by synchrotron powder diffraction in an average P63P63 model. The structural features of the metastable phase were investigated using infrared and Raman spectroscopies and by studying the luminescence properties of the Eu3+Eu3+doped phases.