Photoluminescent and Magnetic Properties of Lanthanide Containing Apatites: Na_xLn_10–x(SiO₄)₆O_2–yF_y, Ca_xLn_10–x(SiO₄)₆O_2–yF_y (Ln = Eu, Gd, and Sm), Gd_9.34(SiO₄)₆O₂, and K_1.32Pr_8.68(SiO₄)₆O_1.36F_0.64, Allison M. Latshaw, Kendall D. Hughey, Mark D. Smith, Jeongho Yeon, Hans-Conrad zur Loye
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