To reveal the relative stability of β and β″-phases in beta alumina, effects of Na20 content and calcination and annealing history on the relative content of β and β″-phases have been studied for compositions ranging from Na2O-5Al2O3 to Na2O-9.5Al2O3. The relative stability appears to be dependent on the calcination or annealing history, except holding time such as annealing or re-annealing time, but independent of the Na2O content and the holding time. From these results it can be demonstrated that the relative stability of β and β″-phases is sensitive to the heat treatment path, except the holding time. The “two stage model” on the β/α. polytypic transition in silicon carbide has been quoted to explain the heat treatment pathdependent characteristics.
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Lee, D., Kim, J. & Kim, Y. The relative stability ofβ andβ″-phases in Na2O-Al2O3 beta alumina. J Mater Sci 25, 2897–2900 (1990). https://doi.org/10.1007/BF00584901
- Heat Treatment