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A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates

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dc.contributor.authorRafiuddin, Mohamed Ruwaid
dc.contributor.authorGrosvenor, Andrew
dc.date.accessioned2018-05-02T15:49:35Z
dc.date.available2018-05-02T15:49:35Z
dc.date.issued2016
dc.description.abstractRhabdophane- (REPO4·nH2O; RE = La to Dy), monazite- (REPO4; RE = La to Gd), and xenotime-type (REPO4 and RE′PO4·nH2O; RE = Tb to Lu and Y; RE′ = Ho to Lu and Y) rare-earth phosphate materials are being considered for a number of applications including as photonic materials, for biolabeling studies, and as potential nuclear wasteforms. Structural studies of hydrous rare-earth phosphates are rather limited when compared to anhydrous rare-earth phosphates. In this study, rhabdophane- (REPO4·nH2O; RE = La, Nd, Sm, Gd, and Dy) and xenotime-type (REPO4·nH2O; RE = Y and Yb) materials were synthesized by a precipitation-based method and investigated using X-ray diffraction (XRD) and X-ray absorption near-edge spectroscopy (XANES). Examination of the powder XRD data from rhabdophane-type materials has confirmed that the rhabdophane structure crystallizes in the monoclinic crystal system rather than the hexagonal structure that has most often been reported. Materials adopting the rhabdophane- or xenotime-type structure were studied as a function of temperature to understand how the structure varies with increasing annealing temperature. Local structural information was obtained by collecting P K- and RE L1-edge XANES spectra. Examination of P K-edge XANES spectra from rhabdophane- and xenotime-type materials revealed changes in the local environment around P as a function of temperature. These changes were attributed to the removal of water from these structures as a result of high temperature annealing.en_US
dc.description.sponsorshipNSERCen_US
dc.identifier.citationInorg. Chem. 2016, 55, 9685−9695en_US
dc.identifier.urihttp://hdl.handle.net/10388/8555
dc.language.isoenen_US
dc.publisherAmerican Chemical Societyen_US
dc.titleA Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphatesen_US
dc.typeArticleen_US

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