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Title: A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates

Abstract

Rhabdophane- (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 Pmore » as a function of temperature. Furthermore, these changes were attributed to the removal of water from these structures as a result of high temperature annealing.« less

Authors:
 [1];  [1]
  1. Univ. of Saskatchewan, Saskatoon, SK (Canada)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC); Canadian Foundation for Innovation (CFI)
OSTI Identifier:
1332570
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 55; Journal Issue: 19; Journal ID: ISSN 0020-1669
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; X-ray absorption near edge spectroscopy; crystal structure; ions; chemical structure; materials

Citation Formats

Rafiuddin, Mohamed Ruwaid, and Grosvenor, Andrew P. A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates. United States: N. p., 2016. Web. doi:10.1021/acs.inorgchem.6b01471.
Rafiuddin, Mohamed Ruwaid, & Grosvenor, Andrew P. A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates. United States. https://doi.org/10.1021/acs.inorgchem.6b01471
Rafiuddin, Mohamed Ruwaid, and Grosvenor, Andrew P. Wed . "A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates". United States. https://doi.org/10.1021/acs.inorgchem.6b01471. https://www.osti.gov/servlets/purl/1332570.
@article{osti_1332570,
title = {A Structural Investigation of Hydrous and Anhydrous Rare-Earth Phosphates},
author = {Rafiuddin, Mohamed Ruwaid and Grosvenor, Andrew P.},
abstractNote = {Rhabdophane- (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. Furthermore, these changes were attributed to the removal of water from these structures as a result of high temperature annealing.},
doi = {10.1021/acs.inorgchem.6b01471},
journal = {Inorganic Chemistry},
number = 19,
volume = 55,
place = {United States},
year = {Wed Sep 14 00:00:00 EDT 2016},
month = {Wed Sep 14 00:00:00 EDT 2016}
}

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