Heat Capacity and Structure of Vitreous Silica and Diamond‐Like Lattices (II)

In a diamond‐like covalent lattice, and in vitreous silica, the phonon spectrum for the main high‐frequency band (containing 80 to 90% of all the modes of vibration) is one dimensional. This leads to the proposed chain model of Tarassov, Pirenne and Renson, and Deltour and Kartheuser. This model is used here to calculate the specific heat of germanium by using the data of Brockhouse and Iyengar. The same method is also applied to InP, AlSb, and vitreous silica.