Abstract
Transmission electron microscopic study of synthetic CaAl2Ge2O8-feldspar revealed two types of antiphase domains: type “b”-antiphase domains with the displacement vector 1/2 [110] and type “c”-antiphase domains with the displacement vector 1/2 [111]. The “b”-domains were on the order of 0.1 μm in size, while the “c”-domains displayed wall to wall distances mostly between 0.1 and 1 μm. The formation of the two types of antiphase domains is due to reductions in translational symmetry associated with the phase transitions \(C\bar 1 \to I\bar 1 \to P\bar 1\). The antiphase domain textures of CaAl2Ge2O8-feldspar are very similar to the textures found in natural and synthetic anorthite, CaAl2Si2O8.
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Müller, W.F., Vojdan-Shemshadi, Y. & Pentinghaus, H. Transmission electron microscopic study of antiphase domains in CaAl2Ge2O8-Feldspar. Phys Chem Minerals 14, 235–237 (1987). https://doi.org/10.1007/BF00307987
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DOI: https://doi.org/10.1007/BF00307987