Acoustic and optical Debye temperatures of the vitreous system CoO-Co2O3-P2O5

For the Co-P-O glass system, data have been assembled on acoustic Debye temperatures obtained from ultrasonic wave-velocity measurements, acoustic and optical Debye temperatures determined from infrared absorption studies, and optical Debye temperatures obtained from electrical conductivity measurements. It is argued that these quantities are systematically related in theory, and the relationships are substantiated by the experimental data.On leave from the Physics Department, Faculty of Science, Monofia University, Shebeen El-Kome, Egypt.