xvii PART I PROPERTIES OF CRYSTALLINE MATERIALS The Effective U in
Oxides and in Sulfides: Conceptual Phase Diagrams and their
Applications . . . . . . . . . . . . . . .; . . . . . . . . . . . .
. . . 1 John B. Goodenough 1. Definitions 1 2. Interatomic
interactions 23 References 44 Electron Correlations in Elementary
Structures. The Case of Weak Correlations: Metallic and Covalent
Bondings . . . . . . . . . . . . . . . . . 45 J. Friedel Introduct
i on 45 1. The H2 molecule 46 2. Other elementary diatomic
molecules 52 3. Metallic aggregates 53 4. Macroscopic phases of
transition metals 57 5. Aggregates and solids of tetravalent (sp)
elements 64 6. Aggregates of covalent dimers 67 7. Weak distortions
of metallic closepacked or covalent structures 69 Appendixes 74
References 82 Statistical Thermodynamics of Mixed Valence at Low
Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . 85 Dieter Wohlleben 1.
Introduction 85 2. The free enthalpy without mixing 86 3. The
valence fluctuation temperature 89 4. 'The free enthalpy with
interconfigurational mlxlng 90 5. Equation of state for the valence
fluctuation n e 6. The conduction electron density of states near
T=O 98 7. Application to Ce metal 101 8. Acknowledgements 104
References 104 Mixed Valency in Inorganic Chemistry . . . . . . . .
. . . . . . . . . . . . 109 P. Day CONTENTS vi Important Discussion
of Part I Intermedi ate Val ency (IV) Compounds . . . . . . . . . .
. . . . . . . . . . . . . . . . 111 N. F. Mott Thermal Expansion
and Specific Heat of Mixed Valence Compounds . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . 117 R. Pott 1. Introduction 117 2. Experiments and
experimental results 117 3. Discussion 120 4. Acknowledgements 122
5."
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