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Abstract
The presence of hydroxyl ions in LaGaO3 single crystals has been detected by means of Fourier Transform Infrared (FTIR) absorption spectroscopy. A single narrow absorption line of the OH− stretching vibration at about 3521 cm−1 has been observed at T=9k in most of the as-grown crystals. The vibrational frequency decreased abruptly at the orthorhombic-rhombohedral structural phase transition temperature (Tc=418K). The parameters of the anharmonic potential of the OH− stretching vibration have been determined from the isotopic replica and the overtone frequency and intensity, and found to be in agreement with those measured for hydroxyl ions in other oxide crystals.