Isothermal evolution of phase composition, structural parameters, and ionic conductivity in Na1+xAlxGe2-x(PO4)3 glass-ceramics - Ortiz-Mosquera, Jairo F.; Nieto-Muñoz, Adriana M.; Bradtmüller, Henrik; Eckert, Hellmut; Rodrigues, Ana C. M. (Journal of Non-Crystalline Solids, 2020)