Sharp, temperature dependent OH/OD IR-absorption bands in nearly stoichiometric (VTE) LiNbO3

IR observation on O–D vibration in LiNbO3 and LiTaO3 single crystal irradiated by 3keV

“…Different from O-D a , O-D b was observed even in experiments without irradiation [15][16][17], which suggest that the irradiation defects are not required for its formation. It has been reported that the proton of the O-H bond corresponding to O-D b lies only 0.02 nm below the oxygen plane (along the c axis) at a distance of 0.1 nm from the corresponding oxygen atom [18].…”

“…In this case, the formation of O-D a and O-D b has been ascribed to the isotope substitution between tritium induced by neutron irradiation and deuterium in D 2 O. O-D b has been indicated by a sharp and predominant peak while O-D a only by a very small peak [14]. On the other hand, if neutron irradiation was not conducted and deuterium was thermally introduced from D 2 O vapor, only O-D b was observed in LiNbO 3 [15] and LiTaO 3 [16,17]. The fact that O-D a was not observed in un-irradiated LiNbO 3 and LiTaO 3 in these experiments indicates that O-D a correlates with certain irradiation defects.…”

Optical properties of Ce:Mn:LiNbO3 crystals with various [Li]/[Nb] ratios

“…When the Li/Nb ratio is 1.20, two new peaks at 3466 and 3479 cm À1 appear at the same time. It was reported that the peak located at 3466 cm À1 indicated the Li/Nb ratio near 1 in the crystal [20]. So intensity.…”

Influence of the calcium excess in the structural and spectroscopic properties of the complex perovskite Ba3CaNb2O9

“…The signal around 0.85 eV for BCN18 in Fig. 7 can be assigned to the second harmonic of an OH vibration as in the case of LiNbO 3 [26][27][28]. This indicates that BCN18 is indeed the composition with the highest proton incorporation of the series.…”