Abstract
Calcite powders subjected to Q-switched laser pulses in water were characterized by X-ray/electron diffraction and optical spectroscopy to have a significant internal compressive stress (up to ca. 1.5GPa) with accompanied transformation into defective calcite II and hydrates. The defective calcite II particles were (010), (001), (01¯1), (013) and (01¯3) faceted with 2×(020)II commensurate superstructure and tended to hydrate epitaxially as monohydrocalcite co-existing with ikaite (CaCO3·6H2O) with extensive cleavages and amorphous calcium carbonate with porous structure. The colloidal suspension containing the densified calcite polymorphs and hydrates showed two UV–visible absorptions corresponding to a minimum band gap of ca. 5 and 3eV, respectively.
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