• Preparation, structure and properties of low valent oxides and fluorides
    • Low valent fluorides of the rare earth elements
    • Low valent oxides of Ti, Nb and Ta
    • Main group element clusters containing interstitial transition metals in low valent oxides and fluorides
    • Titanates of divalent Eu and Sm: possible candidates for multiferroic materials
  • Transition metal anions in polar intermetallic phases
  • Electronic structures of solids
  • Structure systematics on the basis of connected polyhedra


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