Abstract
Powder samples of the system Sr3−xCaxAl2O6 (x = 0, 0.3, …, 2.7, 3.0) were prepared by means of solid state reactions at 1723 K. The lattice constants determined exhibit a linear dependence from the molar fraction x in the range 0.9 ≤ x ≤ 3. For smaller values of x distinct deviations from this linearity are observed. As shown by the results of three single crystal investigations which could be carried out on crystals with x = 1.395(8), 1.62(1), and 2.12(1) this is due to a remarkable distribution of the earth alkaline metal atoms, which is far from being only statistical over the six crystallographically different sites.
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