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Synthesis, crystal structure and luminescent properties of pyrovanadates A(2)CaV(2)O(7) (A = Rb, Cs)
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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2009 (English)In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 11, no 3, 726-732 p.Article in journal (Refereed) Published
Abstract [en]

The novel vanadium oxides Rb2CaV2O7 and Cs2CaV2O7 have been prepared by solid-state reaction and their crystal structures determined and refined using X-ray, neutron powder and electron diffraction data. Rb2CaV2O7 and Cs2CaV2O7 are isostructural, crystallizing in space group P21/n with unit cell parameters: a = 13.8780(1), b = 5.96394(5), c = 10.3376(1) Å, ? = 104.960(1)º and a = 14.0713(2), b = 6.0934(1), c = 10.5944(1) Å, ? = 104.608(1)º, respectively. Their crystal structures can be described as a framework of CaO6 octahedra and V2O7 pyrogroups with alkaline metals found in the tunnels formed. Photoluminescence (PL) and PL excitation spectra of the concerned pyrovanadates have been studied in the vacuum ultraviolet (VUV) to visible light (VIS) range as well as their pulse cathode luminescence (PCL) spectra and the kinetic parameters of PCL. In the PL and the PCL spectra of both pyrovanadates recorded at T = 300 K a broad band with maxima at 2.38, 2.2 eV and a shoulder (band) at 2.08 eV have been observed. At T = 10 K the band at 2.08 eV becomes the main band in the spectra. Two types of luminescence centers for each pyrovanadates, with very similar excitation bands at 3.75, 4.84, 6.2, 7.3 and 9.1 eV, have been found. The nature of the luminescence centers connected with the band 2.08 eV (center I) and the bands 2.2 and 2.38 eV (center II) is discussed

Place, publisher, year, edition, pages
2009. Vol. 11, no 3, 726-732 p.
Keyword [en]
rubidium and cesium vanadium oxide, pyrovanadates, X-ray powder diffraction, Rietveld refinement, crystal structure, electron diffraction, photoluminescence, pulse cathode luminescence
National Category
Chemical Sciences
Research subject
Structural Chemistry
Identifiers
URN: urn:nbn:se:su:diva-36629DOI: 10.1016/j.solidstatesciences.2008.09.009ISI: 000264644800020OAI: oai:DiVA.org:su-36629DiVA: diva2:289999
Note
övrigt antal författare 7st.Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2017-12-12Bibliographically approved

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