Abstract
Rietveld refinements of X-ray powder diffraction data have confirmed the crystal structure of BaCa 2MgSi 2O 8 prepared by a standard solid-state method. The final reliable factors were R wp=10.91%, R p=8.10%, R I=2.71%, and R F=1.14%. BaCa 2MgSi 2O 8 crystallizes in the trigonal space group P3¯m1 (no. 164) with a=5.430(3) Å and c=6.807(2) Å. The oxide has a layered structure constructed from the unit layers built up by corner-sharing MgO 6 octahedra and SiO 4 tetrahedra. Ba and Ca atoms occupy the distinct crystallographic sites; Ba atom is sited in the interlayer space and Ca atom is embedded in the layer framework. This structure was not disrupted by doping of Eu 2+ ions. The Eu 2+-doped BaCa 2MgSi 2O 8 exhibited an intense blue emission based on 5d–4f electron transitions of Eu 2+ ions under 254 nm excitation. This emission has a sufficient chromaticity as a blue phosphor. An additional analysis of the emission spectra using an empirical formula indicates that Eu 2+ is distributed into both Ba and Ca sites.
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