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Rare Earth-Doped Phosphors for White LEDs Chapter 278 33 TABLE 1 Crystallographic Data of Ba2MgSi2O7 (Komeno et al., 2006) Space Group C2/c Rwp 5.65% a (nm) 0.8425 (8) Rp 4.34% b (nm) 1.0732 (8) RR 9.84% c (nm) 0.8454 (8) Re 4.57% b (°) 110.723 (5) S 1.23 Atoms Site g x y z B (nm2) Atomic parameters Ba1 8f 1 0.272(5) 0.044(1) 0.476(1) 0.0084(4) Mg1 4e 1 0.0 0.744(1) 0.25 0.009(2) Si1 8f 1 0.111(1) 0.282(5) 0.133(1) 0.007(1) O1 8f 1 0.100(1) 0.142(1) 0.120(2) 0.015(3) O2 8f 1 0.303(1) 0.342(1) 0.235(1) 0.003(1) O3 8f 1 0.479(1) 0.149(1) 0.042(1) 0.001(4) O4 4e 1 0.0 0.334(1) 0.25 0.009(4) FIG. 28 Crystal structure and coordination environment of Ba/EuO8 in Ba2MgSi2O7. The unit of bond distance is nm. Pictures were drawn based on the structure data obtained from the database (ICSD #154589). b1⁄4110.763° (Toda et al., 2006). The crystal structure of Ba2MgSi2O7:Eu2+ reported by Toda et al. is shown in Fig. 28. The structure has a layered struc- ture, in which the Ba2+/Eu2+ ions are separated by SiO4 and MgO4 tetrahe- dra layers perpendicular to b-axis. In the tetragonal Ba2MgSi2O7 structure, Ba2+ ions have eightfold oxygen coordination in a centrosymmetric site.PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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