OH- vibrational band in YVO4 crystals

An infrared absorption band at about 3307 cm(-1) was detected and attribute d to the 0 --> 1 stretching vibrational transition of hydroxyl ions (OH-) i n yttrium orthovanadate (YVO4) single crystals. The isotopic replica (OD-) was found at about 2455 cm(-1) confirming the above assignment. The Morse-p otential model was applied to determine the anharmonicity parameters of the hydroxyl vibration. Polarization measurements showed that the OH- dipoles lay in the plane perpendicular to the tetragonal axis. The temperature depe ndence of the band parameters was analysed using the model of weakly couple d phonons. (C) 1999 Elsevier Science Ltd. All rights reserved.