Chapter

Classification and Structure of Doped Fullerenes 224

8.1. Classification of Types of Doping for Fullerenes 225

8.2. Endohedral Doping 228

8.3. Substitutional Doping 233

8.4. Exohedral Doping 234

8.4.1. Exohedral Charge Transfer Compounds 235

8.4.2. Exohedral Clathrate Qq Compounds 236

8.4.3. Positron Exohedral Trapping 238

8.5. Structure of Alkali Metal-Doped C60 Crystals 238

8.5.1. M3C60 Alkali Metal Structures 241

8.5.2. M1C60, M4C60, and M6C60 Structures (M = K, Rb, Cs) . . 247

8.5.3. Na^Qo Structures 249

8.5.4. Structures for M2MiC60 and Related Compounds 251

8.5.5. Structure of Ammoniated M3C60 Compounds 253

8.6. Structure of Alkaline Earth-Doped C60 253

8.6.1. Ca,C60 Structure 254

8.6.2. Sr.C 60 and BaxC60 Structures 254

8.6.3. Rare Earth RXC60 Structures 256

8.7. Structure of Other Crystalline Fulleride Phases 256

8.7.1. Halogen-Doped Fullerenes 257

8.7.2. Fullerene Epoxides and Related Compounds 258

8.7.4. Metal-Q, Multilayer Structures 261

8.8. The Doping of C70 and Higher-Mass Fullerenes 262

References 263

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