## The Modern Theory of Solids |

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actually addition alkali approximation associated assume atoms band becomes cell Chap charge chloride classical closely computed condition conductivity consider constant contains coordinates correlation corresponding crystal curve density dependence derived determined direction discussed distance distribution effect electrons energy equal equation example exchange excited expression extends fact field forces frequency given Hence important independent integral interaction ionic ions lattice levels lowest mean measured metals method modes namely negative normal observed obtained occur operator phase Phys Physik plane positive possible potential present quantity quantum quantum mechanics range reason region relation relative satisfy scheme shown shows simple sodium solid solutions space specific heat structure surface symmetrical Table temperature theory tion transition unit usually valence values vector vibration volume wave functions zero zone