Abstract
The coordination environment around Ti4+ in the photoluminescent compound BaTiSi2O7 and in BaTiSi4O11 was investigated with X-ray absorption near-edge structure spectroscopy and micro-Raman spectroscopy. The presence of VTi in TiO5 pyramidal units with one short Ti–O bond involving the apical oxygen was detected in both compounds. Interpretation of the vibrational signal from the silicate framework suggested that BaTiSi4O11 is a metasilicate containing building units of SiO4 tetrahedra, which are larger than in other barium titanosilicates. These results confirmed the same structural environment of Ti4+ as recently disclosed by structure refinement of BaTiSi2O7 and provided new insights into the unknown structure of BaTiSi4O11 in the light of the study of its physical properties as potential functional material.
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Acknowledgments
This research was partially supported by the Project No. LO1219 under the Ministry of Education, Youth and Sports National sustainability programme I of Czech Republic. Experiments at the Elettra synchrotron facility (Basovizza, TS, Italy) (Proposal Nr. 20140188) were granted as Italian funded user.
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Viani, A., Pollastri, S., Macova, P. et al. XANES and micro-Raman spectroscopy study of the barium titanosilicates BaTiSi2O7 and BaTiSi4O11 . Appl. Phys. A 122, 372 (2016). https://doi.org/10.1007/s00339-016-9959-0
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DOI: https://doi.org/10.1007/s00339-016-9959-0