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absolute zero according to equation adiabatic Aeronauthes alkali metals amplitude approximately aragonite assumption atomhe atomic frequency atomic heat atomic volume Born Bragg c f c cadmium calcite CD CD compounds computed constant crystal lattice crystals without group cubic Debre tAeorr Debye deformation diamond distance elastic electrons elements entropy equation 39 expansion coefficient Fajans Februarr 199W fluorite formula Germanr Griineisen group formation Gruneisen halogen HanAuAS der 9W9W9W hexagonal homopolar Hooke's law ionic lattices ions isotropic kcal lattice energy lattices without group limiting frequency Lindemann materials metals mole molecule NAsi neighboring atoms Nernst NOLID nucleus observed obtained order of magnitude Phys Polyatomic potential energy pressure coefficient ratio regular crystals repulsion force solid body soltds are treated space lattice STATh Subjerts summarr temperature tetragonal theoretically theory thermal energy thermal expansion thermodrnamhe triclinic trig values vibrations Zustand