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Rare-earth silicon-oxynitride J-phases, Ln 4 Si 2 O 7 N 2 (Ln=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), were prepared by the N 2 gas-pressured sintering method at 1MPa of N 2 and 1500-1700 o C. The Rietveld analysis was carried out for X-ray powder diffraction data measured at room temperature. The crystal structures of Ln 4...
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