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

Journal Article · · Inorganic Chemistry
 [1];  [1]
  1. Univ. of Saskatchewan, Saskatoon, SK (Canada)
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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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC); Canadian Foundation for Innovation (CFI)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1332570
Journal Information:
Inorganic Chemistry, Vol. 55, Issue 19; ISSN 0020-1669
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (9)

Enhanced hydrothermal crystallization and color tailorable photoluminescence of hexagonal structured YPO 4 :Sm/Tb nanorods journal January 2018
An interplay between electronic and structural effects on the photoluminescence decay mechanisms in LaPO 4 · n H 2 O:Tb 3+ and LaPO 4 :Tb 3+ single-crystal nanorods journal January 2018
Heteroleptic samarium( iii ) halide complexes probed by fluorescence-detected L 3 -edge X-ray absorption spectroscopy journal January 2018
Local Structure Study of Lanthanide Elements by X‐Ray Absorption Near Edge Structure Spectroscopy journal September 2018
Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure: Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure journal January 2019
Lanthanide phosphate (LnPO 4 ) rods as bio‐probes: A systematic investigation on structural, optical, magnetic, and biological characteristics
  • Meenambal, Rugmani; Poojar, Pavan; Geethanath, Sairam
  • Journal of Biomedical Materials Research Part B: Applied Biomaterials, Vol. 107, Issue 5 https://doi.org/10.1002/jbm.b.34229
journal September 2018
Synthesis and characterization of intrinsically radiolabeled lanthanide phosphate nanoparticles toward biomedical and environmental applications journal September 2018
Structure dependent luminescence, peroxidase mimetic and hydrogen peroxide sensing of samarium doped cerium phosphate nanorods journal January 2018
Synthesis of self-assembled spindle-like CePO 4 with electrochemical sensing performance journal January 2020

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
X-ray absorption near edge spectroscopy
crystal structure
ions
chemical structure
materials