Lanthanite-(Nd), Nd2(CO3)3·8H2O
نویسندگان
چکیده
Lanthanite-(Nd), ideally Nd2(CO3)3·8H2O [dineodymium(III) tricarbonate octa-hydrate], is a member of the lanthanite mineral group characterized by the general formula REE2(CO3)3·8H2O, where REE is a 10-coordinated rare earth element. Based on single-crystal X-ray diffraction of a natural sample from Mitsukoshi, Hizen-cho, Karatsu City, Saga Prefecture, Japan, this study presents the first structure determination of lanthanite-(Nd). Its structure is very similar to that of other members of the lanthanite group. It is composed of infinite sheets made up of corner- and edge-sharing of two NdO10-polyhedra (both with site symmetry ..2) and two carbonate triangles (site symmetries ..2 and 1) parallel to the ab plane, and stacked perpendicular to c. These layers are linked to one another only through hydrogen bonding involving the water mol-ecules.
منابع مشابه
Processing and Characterization of Microwave Dielectric Ceramics and Thin Films-Nd2(Ti2/3Al1/3)3O9-δ and (Ba0.7Sr0.3)TiO3
Reactive powders of stoichiometry Nd2(Ti2/3Al1/3)3O9-δ and thin films of (Ba0.7Sr0.3)TiO3 have been prepared by the conventional mixed-oxide method and the metal-organic deposition method, respectively. The corresponded phases after calcination and sintering are investigated by XRD diffraction. Single phase of Nd2(Ti2/3Al1/3)3O9-δ could be only obtained by sintering over 1400C for 4 h. (Ba0.7Sr...
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