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Title: Growth, structural, IR and magnetic studies of a new gadolinium metaphosphate, Gd(PO{sub 3}){sub 3}

The crystal structure of gadolinium metaphosphate Gd(PO{sub 3}){sub 3} has been established by X-ray diffraction. This compound crystallizes in the orthorhombic system (space group C222{sub 1}, Z=4) with cell parameters: a=8.4530 (3), b=11.0576 (4) and c=7.1952 (2)A. The structure was refined to R{sub 1}=0.0234 and wR{sub 2}=0.0502 using 2180 independent reflections (I>2{sigma}(I)). Phosphorus atoms are in slightly irregular tetrahedral oxygen coordination, gadolinium atoms are in considerably distorted dodecahedral oxygen coordination. Formally, the 3D framework in the structure can be described by the PO{sub 4} tetrahedra sharing corners to form helical chains and the GdO{sub 8} polyhedra sharing edges in a zigzag fashion. The shortest Gd-Gd distance is 4.174 (2)A. The infrared spectrum of the title compound recorded at room temperature in the frequency range of 400-4000cm{sup -1}, confirm the atomic arrangement within the structure. Below T{sub C}=25K, the magnetic susceptibility evolution is characteristic of a ferromagnetic order. In the high-temperature region above 100K, the susceptibility follows a Curie-Weiss law with C=7.91cm{sup 3}Kmol{sup -1} and {theta}=9.96K.
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Laboratoire de L'Etat Solide, Faculte des Sciences de Sfax BP 802, Sfax 3018 (Tunisia). E-mail: houcine_naili@yahoo.com
  2. Laboratoire de L'Etat Solide, Faculte des Sciences de Sfax BP 802, Sfax 3018 (Tunisia)
  3. Unite de Recherche des Materiaux, Faculte des Sciences de Sfax BP 802, Sfax 3018 (Tunisia)
Publication Date:
OSTI Identifier:
20891940
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 41; Journal Issue: 11; Other Information: DOI: 10.1016/j.materresbull.2006.06.014; PII: S0025-5408(06)00254-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; CRYSTAL GROWTH; CURIE-WEISS LAW; FREQUENCY RANGE; GADOLINIUM PHOSPHATES; INFRARED SPECTRA; MAGNETIC SUSCEPTIBILITY; ORTHORHOMBIC LATTICES; PHOSPHORUS; SPACE GROUPS; X-RAY DIFFRACTION