Incorporation mechanisms of niobium into lithium borate glasses: insights from solid state nuclear magnetic resonance and Raman spectroscopy - Pena, Rafaella Bartz; Bradtmüller, Henrik; Ensuncho Hernandez, Laureano Javier; Oliveira Junior, Marcos de; Eckert, Hellmut (Journal of Non-Crystalline Solids, 2026)