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- W3178709619 abstract "During phase transitions the ordering of cations and/or anions along specific crystallographic directions can take place. As a result, extra reflections may occur in diffraction patterns, which can indicate cell doubling and the reduction of the crystallographic symmetry. However, similar features may also arise from twinning. Here the nanostructures of a glendonite, a calcite (CaCO3) pseudomorph after ikaite (CaCO3·6H2O), from Victoria Cave (Russia) were studied using transmission electron microscopy (TEM). This paper demonstrates the occurrence of extra reflections at positions halfway between the Bragg reflections of calcite in 0kl electron diffraction patterns and the doubling of d104 spacings (corresponding to 2∙3.03 Å) in high-resolution TEM images. Interestingly, these diffraction features match with the so-called carbonate c-type reflections, which are associated with Mg and Ca ordering, a phenomenon that cannot occur in pure calcite. TEM and crystallographic analysis suggests that, in fact, (101¯4) calcite twins and the orientation change of CO3 groups across the twin interface are responsible for the extra reflections." @default.
- W3178709619 created "2021-07-19" @default.
- W3178709619 creator A5025927509 @default.
- W3178709619 date "2021-07-04" @default.
- W3178709619 modified "2023-10-17" @default.
- W3178709619 title "Diffraction Features from (101¯4) Calcite Twins Mimicking Crystallographic Ordering" @default.
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- W3178709619 doi "https://doi.org/10.3390/min11070720" @default.
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