Luminescent properties of ceramics GdNbO4 obtained by usual technology and by hot pressing
Usual ceramic technology (UCT) and hot pressing (HP) have been applied to obtain GdNbO4 ceramic samples. Both samples were vacuum annealed. Photoluminescence spectra of the samples: a) - GdNbO4 (UCT) before and after vacuum annealing; b) GdNbO4 (HP) before and after vacuum annealing. Photoluminescence spectra of the studied samples were recorded by a SOL SL-100M spectrograph with a FLI ML 1107 CCD detector BlackIlluminated (Hamamatsu) in the visible spectrum (380-800 nm). An excitation source was He-Cd laser with λex=325 nm and 15 mW. The input slit of the monochromator was 0.002 mm.