Abstract
Creep and conductivity were measured for polycrystalline α-Al2O3 doped with titanium or iron plus titanium. Both series of samples show a transition from acceptor domination to donor domination at the point where the concentrations of titanium and acceptors are approximately equal. Parameters in the expression for the creep rate\(\dot \varepsilon \) ∞S nd-PPr O 2 exp (-QlkT) (whereS is the applied stress,d the grain size,Q an activation energy andn, p, r are constants characterizing the creep mechanism) indicate limitation by bulk diffusion in the acceptor-dominated samples and in the donor-dominated samples at low [Ti]. In the latter samples the ratelimiting species isO i″ at highP O 2, VA Al′″ at lowP O 2, with involvement of e′ at mediumP O 2. At higher titanium concentrations the creep rate is limited by generation/recombination of defects at grain boundaries. Iron appears to increase the rate of these grain-boundary reactions. When second-phase particles of Al2TiO5 are present,\(\dot \varepsilon \) is decreased but ionic conductivity is increased.
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Tsaur, J.M., Kroger, F.A. Electrical conductivity and creep of polycrystalline α-Al2O3 doped with titanium or iron plus titanium. J Mater Sci 22, 2332–2340 (1987). https://doi.org/10.1007/BF01082112
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DOI: https://doi.org/10.1007/BF01082112