“…Ultrasonic data at room conditions are from Akimoto (1972), diamond, Wang et al (1989), asterisk. Results from static compression: Plymate and Stout (1990), triangle, Takahashi (1970), cross, Yagi et al (1975), plus Burns (1985) e g 9,270 5 M2 Burns (1985) anharmonicity, a j = a j,0 (V/V 0 ) m , in which a j,0 represents the anharmonicity parameter of a specific mode j at 0 K. That results in the same unsuccessful effect on the heat capacity. Presently, we are not able to resolve the discrepancy between our calculations and the experimental data of Orr (1953).…”