Citation: Esser, M.; Burianek, M.; Muehlberg, M.; Bulut, S.; Held, P.; Stade, J.; Wickleder, C. (2003). Optical characterization and crystal structure of the novel bronze type Cax Ba1-x Nb2 O6 (x = 0.28; CBN-28). Crystal Research and Technology, 38, pp. 457-464.