List references from the University of Geneva Physical Chemistry reference database

The phosphor CaTiO₃:Pr³⁺Â was synthesized via a solid-state reaction in combination with a subsequent annealing under flowing NH₃. Comparatively large off-center displacements of Ti in the TiO₆Â octahedra were confirmed for as-synthesized CaTiO₃:Pr³Â by XANES. Raman spectroscopy showed that the local crystal structure becomes highly symmetric when the powders are ammonolyzed at 400 Â°C. Rietveld refinement of powder X-ray diffraction data revealed that the samples ammonolyzed at 400 Â°C have the smallest lattice strain and at the same time the largest average Ti-O-Ti angles were obtained. The samples ammonolyzed at 400 Â°C also showed the smallest mass loss during the thermal re-oxidation in thermogravimetric analysis (TGA). Enhanced photolumincescence brightness and an improved decay curve as well as the highest reflectance were obtained for the samples ammonolyzed at 400 Â°C. The improved photoluminescence and afterglow by NH₃Â treatment are explained as a result of the reduced concentration of oxygen excesses with simultaneous relaxation of the lattice strain.

Improved photoluminescence and afterglow of CaTiO₃:Pr³⁺ by ammonia treatment S. Yoon, E.H. Otal, A.E. Maegli, L. Karvonen, S.K. Matam, S. Riegg, S.G. Ebbinghaus, J.C. Fallas, H. Hagemann, B. Walfort, S. Pokrant and A. Weidenkaff Optical Materials Express, 3 (2) (2013), p248-259 DOI:10.1364/OME.3.000248 \| unige:26402 \| Abstract \| Article HTML \| Article PDF
The phosphor CaTiO₃:Pr³⁺Â was synthesized via a solid-state reaction in combination with a subsequent annealing under flowing NH₃. Comparatively large off-center displacements of Ti in the TiO₆Â octahedra were confirmed for as-synthesized CaTiO₃:Pr³Â by XANES. Raman spectroscopy showed that the local crystal structure becomes highly symmetric when the powders are ammonolyzed at 400 Â°C. Rietveld refinement of powder X-ray diffraction data revealed that the samples ammonolyzed at 400 Â°C have the smallest lattice strain and at the same time the largest average Ti-O-Ti angles were obtained. The samples ammonolyzed at 400 Â°C also showed the smallest mass loss during the thermal re-oxidation in thermogravimetric analysis (TGA). Enhanced photolumincescence brightness and an improved decay curve as well as the highest reflectance were obtained for the samples ammonolyzed at 400 Â°C. The improved photoluminescence and afterglow by NH₃Â treatment are explained as a result of the reduced concentration of oxygen excesses with simultaneous relaxation of the lattice strain.

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