Chemistry > Carbon Allotropes, Band Theory of Solids
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Carbon Allotropes, Band Theory of Solids

  • Network solids are giant molecules

  • Difference between graphite – sheets of hexagons of C – and diamond – 3D tetrahedral network; properties related to structures

  • Novel carbon frameworks C-60 – buckyball; nanotubes

  • Conductivity varies metals >> semiconductors > insulators

  • In large crystals MOs combine to give bands; valence band; conduction band

  • Doping of insulator like Si with P gives n-type semiconductor

  • Doping of Si with Al gives p-type semiconductor

  • p/n junctions yield transistors and chips

  • Glasses: common ones made from quartz, sodium carbonate, calcium oxide; amorphous