User:Benjah-bmm27/degree/3/NLA

=Chemistry of solids, NLA=

Bonding and electronic structure in solids

 * Bonding in solids
 * Band theory, Fermi level
 * Electrical insulator, semiconductor, electrical conductor
 * Photoelectron spectroscopy of solids
 * Wave vector, k
 * Band structure diagrams

Metallic conductivity in transition metal oxides

 * Non-stoichiometry
 * The monoxides MO have the rocksalt structure
 * TiOx (0.7 > x > 1.25) and VO are metallic conductors
 * overlap of t2g 3d orbitals from neighbouring Ti(II) atoms results in a t2g conduction band
 * MnO and NiO are insulators because their t2g 3d orbitals are too contracted to overlap due to the greater electronegativity of Mn and Ni
 * FeO and CoO are also insulators, whereas second and third row transition metal oxides are more commonly metallic conductors
 * Electrical conductivity in transition metal dioxides
 * TiO2 and VO2
 * Electrical conductivity in transition metal trioxides
 * ReO3 &mdash; Re(VI) is d1, lustrous red metallic conductor
 * High oxidation state Re so direct d-d orbital overlap very unlikely &mdash; partially filled &pi;-band arises from Re(5d)-O(2p) overlap
 * WO3 &mdash; W(VI) is d0, insulator
 * NaxWO3 &mdash; W(V) is d1, gold-coloured metallic conductor

Semiconductors

 * Semiconductors
 * Intrinsic semiconductors &mdash; band gap Eg is small enough that electrons from the valence band can be thermally excited to the conduction band, so T↑ leads to conduction↑
 * Zone refining
 * Extrinsic semiconductors &mdash; doped with As (one more e− than Si or Ge, N-type) or Ga (one less e− than Si or Ge, P-type)
 * N-type semiconductors
 * P-type semiconductors
 * III-V materials e.g. GaAs (isoelectronic with Ge)
 * p-n junction
 * Carrier generation and recombination
 * Photovoltaic effect
 * Transistors: npn and pnp

Defects and non-stoichiometry

 * Crystallographic defects
 * Point defects
 * Vacancy defects (e.g. Schottky defects)
 * Interstitial defects (e.g. Frenkel defects)
 * Antisite defects
 * Electronic defects
 * Extended defects
 * Dislocations
 * Intrinsic defects (present in pure material)
 * Anion Frenkel defects in compounds with the fluorite structure (e.g. CaF2, ZrO2, UO2)
 * Cation Frenkel defects in compounds with the antifluorite structure (e.g. Li2O)
 * Extrinsic defects (introduced by doping)
 * Kröger–Vink Notation for heterovalent doping
 * Ionic conductivity and fast ion conductors
 * Nernst-Einstein equation
 * Silver iodide
 * Beta-alumina solid electrolytes
 * Solid oxide fuel cell

Superconductors

 * High-temperature superconductivity, virtual experiment
 * Cooper pairs
 * Cuprate superconductors
 * Yttrium barium copper oxide
 * Lanthanum barium copper oxide