Abstract
Single crystals of Co 2+-stabilized β″-alumina were synthesized by a flux growth technique using Bi 2O 3 as the flux and subsequent X-ray crystallographic studies showed that the Co 2+ ions substitute only at the Al(2) sites. Optical absorption spectroscopic measurement also supports the concept that the dopant ions are in distorted tetrahedral environment. Co 2+-doped β-alumina crystals were made by a skull melting technique. Chemical analysis of these two materials indicated that the Co 2+ ion concentration may be important in the formation of one phase over the other. The temperature-dependent ionic conductivity of Co 2+-stabilized β″-alumina, Co 2+-doped β-alumina, and undoped β-alumina has been measured and compared between 25 and 450°C. The detailed conductivity analysis was made by a phase-synchronous detection system in the frequency range 100 Hz-10 MHz. The conductivity is highest in the stabilized β″-alumina and lowest in the undoped β-alumina. For Co 2+-doped β-alumina, a slight bend in the conductivity at around 200°C is noted. The analysis of the conductivity and the effect of the dopant Co 2+ ions on the resulting conductivity is discussed.
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