Activation energy and its fluctuations at grain boundaries of Er3+:BaTiO3 perovskite thin films: effect of doping concentration and annealing temperature - Huaman, Jose Luis Clabel; Nazrin, S. N.; Calderón, Gaston Lozano; Silva, Marcelo de Assumpção Pereira da; Siu Li, Máximo; Marega Junior, Euclydes (Vacuum, 2021)