Elastic constants ionic compounds

Since the X-ray diffraction studies of Zintl et al. , these members of the family of intermetallic compounds have been of special interest because some of their chemical properties are unusual for intermetallic phases. Many experimental investigations have been reported for binary and ternary B32 type compounds. Besides the crystal structure " , the thermodynamic behavior , electrical conductivity ", magnetic susceptibility , NMR data elastic constants - and optical properties have been studied. Additionally for LiAl electrochemical investigations have been performed in view of the recent interest in fast ionic conductors " . ... 

Given this description of the forces, there is no difficulty in carrying out the calculation of the full vibration spectrum for an ionic solid in the manner described in Chapter 9. At least for the compounds we have considered here the structures are sufficiently simple that the complications which arose in calculating the spectra for the mixed tetrahedral solids are not present. The elastic constants describe the low-frequency lattice vibrations and there is no reason to expect the description at high frequencies to be either worse or better. (Some discussion of the vibration spectra of ionic crystals is given, for example, by Wallis, 1965 a number of properties related to anharmonicity are described by Cowley, 1971.)... 

Crystal elastic constants, 12-33 to 38 Crystal ionic radii, 12-11 to 12 Crystal lattice energy, 12-19 to 31,12-32 Crystal optical properties elements, 12-121 to 145 inorganic compounds, 10-246 to 249 minerals, 4-149 to 155 various materials, 12-146 to 164 Crystal structure... 

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