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- W2071288059 abstract "Type B rare earth hydroxycarbonate (LnOH)CO3 is a lamellar hexagonal structure isomorphous to bastnaesite LnFCO3. Type II oxycarbonate (LnO)2CO3 is another hexagonal lamellar structure built on an (LnO)n+n complex cation of ternary symmetry. Lattice images were obtained for both compounds directly exhibiting the lamellar character. The thermal decomposition of the hydroxycarbonate into the oxycarbonate was followed in the electron microscope. The transition is topotactic and the crystallographic orientations were determined. The two compounds may have their triad axes and the [110] (hydroxycarbonate) and [010] (oxycarbonate) axes in common, or the two thiad axes may be parallel and the lamellar structures may merge together. The oxycarbonate then appears in the form of bubbles in the hydroxycarbonate matrix, because of a slight deficiency (12 to 14) in the number of rare earth atom planes for the same distance along the triad axes for the oxycarbonate versus the hydroxycarbonate." @default.
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- W2071288059 date "1975-12-01" @default.
- W2071288059 modified "2023-09-23" @default.
- W2071288059 title "Observation directe par microscopie electronique a haute resolution de la transformation des hydroxycarbonates de terres rares (type B) en oxycarbonates (type II)" @default.
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- W2071288059 doi "https://doi.org/10.1016/0022-4596(75)90286-8" @default.
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