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Defect-property correlations in garnet crystals. III. The electrical conductivity and defect structure of luminescent nickel-doped yttrium aluminum garnet (1987)

Rotman, S. R. ; Tuller, H. L.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 62 (1987), S. 1305-1312

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

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

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.339656

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