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Title: The crystal structure, thermal behaviour and ionic conductivity of a novel lithium gadolinium polyphosphate LiGd(PO{sub 3}){sub 4}

Crystal structure and ionic conductivity of lithium gadolinium polyphosphate, LiGd(PO{sub 3}){sub 4}, were investigated. Single crystals of the title compound have been grown by a flux technique. The structure of this novel phosphate was determined by single crystal X-ray diffraction techniques. LiGd(PO{sub 3}){sub 4} is isotypic with LiNd(PO{sub 3}){sub 4}. It crystallizes in the monoclinic space group C2/c with the unit cell parameters a=16.386(2), b=7.059(3), c=9.677(2) A, {beta}=126.12(1){sup o}, V=904.2(4) A{sup 3} and Z=4. The structure refined from 967 independent reflections leads to R {sub 1}=0.0167 and wR {sub 2}=0.0458. The lattice of LiGd(PO{sub 3}){sub 4} is built of twisted zig-zag chains running along with the b direction and make up of PO{sub 4} tetrahedra sharing two corners, connected to the GdO{sub 8} and LiO{sub 4} polyhedra by common oxygen atoms to form a three-dimensional framework. Differential and thermogravimetric thermal analysis are given. The thermal curve of this compound was recorded and interpreted in agreement with impedance measurements. The ionic conductivity has been measured on pellet of the polycrystalline powder and evaluated as a function of temperature. This phase showed the conductivity of 2x10{sup -6} and 2x10{sup -4} {omega}{sup -1} cm{sup -1} at 682 and 951 K, respectively. - Graphicalmore » abstract: The structural arrangement of LiGd(PO{sub 3}){sub 4} viewed in the (0 1 0) plane.« less
Authors:
 [1] ;  [2] ;  [1]
  1. Laboratoire de l'Etat Solide (L.E.S), Universite de Sfax, Faculte des Sciences de Sfax, 3018 Sfax (Tunisia)
  2. Laboratoire de l'Etat Solide (L.E.S), Universite de Sfax, Faculte des Sciences de Sfax, 3018 Sfax (Tunisia). E-mail: houcine_naili@yahoo.com
Publication Date:
OSTI Identifier:
20900853
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 10; Other Information: DOI: 10.1016/j.jssc.2006.06.003; PII: S0022-4596(06)00335-5; 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; GADOLINIUM PHOSPHATES; IMPEDANCE; IONIC CONDUCTIVITY; LITHIUM PHOSPHATES; MONOCLINIC LATTICES; MONOCRYSTALS; POLYCRYSTALS; REFLECTION; SPACE GROUPS; SPECTROSCOPY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION