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- W139886051 abstract "Samarskite, a chemically complex Nb,Ta oxide with high contents of U and Th has been considered X-ray amorphous. So far, detailed structural information has been deduced from crystallized reaction products after the mineral has undergone heat treatment up to 1000/sup 0/C. In this study, untreated (neither thermal nor physical) samarskite from Mitchell County, N.C. with a composition approximated by AB/sub 2/O/sub 6/ where A ions are Y, U and rare earths and B ions are Nb, Ta and Fe, has been investigated by large X-ray diffraction using AgK..cap alpha.. as radiation probe. From the observed diffraction data, the total scattered intensity per atom I/sub a/(K) was determined and Fourier transformed, to obtain the radial distribution function (RDF), which revealed the closest metal-oxygen distances (r/sub A-O/ = 2.4 angstrom and r/sub B-O/ = 2.0 angstrom). The area under the first peak corresponds to 3.6 +/- 1 atoms, which indicates that the sum of oxygen ions about an A and B-type ion lies between 11 and 12 atoms. The RDF of metamict samarskite appears to be typical for the short range order found in truly amorphous solids." @default.
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- W139886051 date "1983-04-01" @default.
- W139886051 modified "2023-09-26" @default.
- W139886051 title "Diffraction analysis of metamict samarskite" @default.
- W139886051 hasPublicationYear "1983" @default.
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