The microstructures of non-metal synthetic compounds, calcium aluminosulphate (the molecular formula is Ca_4Al_6SO_(16), abbreviated as C_4A_3S) and belite (the molecular formula is Ca_2SiO_4, abbreviated as C2S) doped with potassium super oxide or sodium superoxide were examined by means of electron diffraction and high resolution transmission electron microscopy (HRTEM). A number of superstructures including one, two and three dimensional superstructures related to the inverse occupation of calcium atoms were identified by electron diffraction and the features of these superstructures were shown clearly in HRTEM images. Besides these superstructures, a lot of domain structures with both the conservative and non-conservative boundaries were also examined.
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