Composition-structure-property correlations in rare-earth doped heavy metal oxyfluoride glasses - Doerenkamp, Carsten; Carvajal, Eduar; Magon, Claudio José; Faria, Walter José Gomes Juste; Donoso, José Pedro; Gobato, Yara Galvão; de Camargo, Andrea Simone Stucchi; Eckert, Hellmut (NMR Users Meeting, 2019)