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DOI 10.1016/j.materresbull.2004.08.007
Title Synthesis, crystal structure and vibrational spectra of a new form of diphosphate NaLaP{sub 2}O{sub 7}
Creator/Author Ferid, M. [Laboratoire des Materiaux, Institut National de Recherche Scientifique et Technique, B.P. 95 Hammam-Lif 2050 (Tunisia)]. E-mail: mokhtar.ferid@inrst.rnrt.tn ; Horchani-Naifer, K. [Laboratoire des Materiaux, Institut National de Recherche Scientifique et Technique, B.P. 95 Hammam-Lif 2050 (Tunisia)]
Publication Date2004 Dec 02
OSTI IdentifierOSTI ID: 20883063
Other Number(s)Journal ID: ISSN 0025-5408; MRBUAC; TRN: US05R2398048453
Resource TypeJournal Article
Resource RelationJournal: Materials Research Bulletin; Journal Volume: 39; Journal Issue: 14-15; Other Information: DOI: 10.1016/j.materresbull.2004.08.007; PII: S0025-5408(04)00265-X; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Subject36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; CATIONS; CHEMICAL PREPARATION; INFRARED SPECTRA; LANTHANUM OXIDES; MONOCRYSTALS; ORTHORHOMBIC LATTICES; PHOSPHATES; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SODIUM OXIDES; SPACE GROUPS; X-RAY DIFFRACTION
Description/Abstract Synthesis and complete structural characterization by X-ray diffraction, Raman and infrared spectroscopy are given for a new form of NaLaP{sub 2}O{sub 7} diphosphate. This compound crystallizes in the orthorhombic Pnma space group with the following unit cell dimensions: a = 8.645(2), b = 5.317(1), c = 12.737(2) A, V = 585.5(2) A{sup 3}, Z = 4. The single crystal structure was solved from 906 independent reflections (Fo2 >= 2{sigma}(Fo2)) with final R{sub 1}(F{sup 2}) = 0.0364 and R{sub w}(F{sup 2}) = 0.0918, refined with 62 parameters. In this structure the P{sub 2}O{sub 7} groups are connected to the LaO{sub 9} polyhedra by edge-sharing to form a three-dimensional framework. The sodium cations are coordinated by nine oxygen atoms and build ribbons of NaO{sub 9} polyhedra running parallel to the b-direction.The energies of the vibrational modes of the crystal were obtained from measurements of the infrared and Raman spectra.
Country of PublicationUnited States
LanguageEnglish
FormatSize: page(s) 2209-2217
System Entry Date2007 Jul 16

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