Abstract
IN all previous studies of the topotaxy of solid state precipitation from spinel crystalline solutions1–5, α-Al2O3 or α-Fe2O3 has been the exsolved phase. In each case, the (0001) plane of the precipitate was aligned parallel to the (111) plane of the spinel crystalline solution matrix. This orientation results in parallel alignment of the closest-packed oxygen planes of the two structures. G. K. and K. R.6, and G. K.7, were the first to show that a structure other than the corundum structure can be precipitated from spinel crystalline solutions. The phase relations and stability fields of the pseudo-binary system MgAl2O4–Ga2O3 were investigated as a preliminary step towards the study of the topotaxy and mechanism of exsolution in spinel–gallia crystalline solutions. It was shown that the phase precipitated was the monoclinic8 β-Ga2O3 structure.
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KATZ, G., NICOL, A. & ROY, R. New Topotaxy in Precipitation from Spinel. Nature 223, 609–610 (1969). https://doi.org/10.1038/223609a0
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DOI: https://doi.org/10.1038/223609a0
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