Electron Pramagnetic Resonance Spectroscopy of Cu(+)/Cu(2+) Beta -Alumina

摘要

Sodium alumina is a well known superionic conductor whose highly anisotropicstructure consists of close-packed 'spinel blocks' of Al, Mg and O separated by more open regions (the two-dimensional conduction planes) in which Na + ion mobility is observed. The material is characterized by a rich ion-exchange chemistry, which gives rise to a variety of monovalent, divalent and trivalent isomorphs. The incorporation of lanthanide and transition-metal ions in alumina has led to considerable interest in the optical properties that this solid electrolyte is capable of possessing. A variety of attractive properties have been observed including tunable emission, energy transfer, up-conversion, waveguiding and laser action. In general, the anisotropic structure of the alumina with its loosely packed conduction plane represents a novel host environment for luminescent ions.