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Figure 1: XRD pattern of NaMgF3, NaMgF3:Tb (0.5 mol%) and NaMgF3:Dy (0.5 mol%)

Figure 1: XRD pattern of NaMgF<sub>3</sub>, NaMgF<sub>3</sub>:Tb (0.5 mol%) and NaMgF<sub>3</sub>:Dy (0.5 mol%)