Defect‐property correlations in garnet crystals: The electrical conductivity and defect structure of luminescent cerium‐doped yttrium aluminum garnet

摘要: The conduction mechanisms in nickel‐doped yttrium aluminum garnet (Ni:YAG) have been studied as a function of temperature and partial pressue oxygen. ac conductivity ionic transference measurements show that Ni:YAG is mixed ionic‐electronic conductor with an mobility characterized by activation energy 2.0–2.2 eV. reduction Ni+3 to Ni+2 causes increase the oxygen vacancy concentration concurrent rise magnitude conductivity. Codoping zirconium, on other hand, fixes nickel divalent state, increases n‐type conductivity, lowers degree A defect model presented which consistent all these observations.