Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111197
Title: Synthesis, Crystal Structure and Luminescent Properties of Pyrovanadates A2CaV2O7 (A = Rb, Cs)
Authors: Zubkov, V. G.
Tyutyunnik, A. P.
Tarakina, N. V.
Berger, I. F.
Surat, L. L.
Slobodin, B. V.
Svensson, G.
Forslund, B.
Shulgin, B. V.
Pustovarov, V. A.
Ishchenko, A. V.
Cherepanov, A. N.
Issue Date: 2009
Publisher: Elsevier BV
Citation: Synthesis, Crystal Structure and Luminescent Properties of Pyrovanadates A2CaV2O7 (A = Rb, Cs) / V. G. Zubkov, A. P. Tyutyunnik, N. V. Tarakina et al. // Solid State Sciences. — 2009. — Vol. 11. — Iss. 3. — P. 726-732.
Abstract: 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, β = 104.960(1)° and a = 14.0713(2), b = 6.0934(1), c = 10.5944(1) Å, β = 104.608(1)°, 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 considered 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 2.2, 2.4 eV and two shoulders (bands) at 2.0 and 2.58 eV have been observed. At T = 10 K the band at 2.0 eV becomes the main band in the spectra. Two types of luminescence centers for each pyrovanadate, 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 bands at 2.0, 2.2, 2.4 and 2.58 eV is discussed. © 2008 Elsevier Masson SAS. All rights reserved.
Keywords: CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
PHOTOLUMINESCENCE
PULSE CATHODE LUMINESCENCE
PYROVANADATES
RIETVELD REFINEMENT
RUBIDIUM AND CESIUM VANADIUM OXIDE
X-RAY POWDER DIFFRACTION
CESIUM
ELECTRON DIFFRACTION
LIGHT
LIGHT EMISSION
METAL REFINING
OXIDES
PHOTOLUMINESCENCE
POWDER METALS
RIETVELD METHOD
RIETVELD REFINEMENT
RUBIDIUM
TRANSITION METALS
VANADIUM
VANADIUM ALLOYS
VANADIUM COMPOUNDS
ALKALINE METALS
BROAD BANDS
ELECTRON-DIFFRACTION DATUM
EXCITATION BANDS
ISOSTRUCTURAL
LUMI-NESCENT PROPERTIES
LUMINESCENCE CENTERS
NEUTRON POWDERS
PL EXCITATIONS
PULSE CATHODE LUMINESCENCE
PYROVANADATES
SOLID-STATE REACTIONS
SPACE GROUPS
UNIT CELL PARAMETERS
VACUUM ULTRA VIOLETS
VISIBLE LIGHTS
X-RAY POWDER DIFFRACTION
CRYSTAL STRUCTURE
URI: http://hdl.handle.net/10995/111197
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 60549090586
ISSN: 1293-2558
metadata.dc.description.sponsorship: This work was supported by the Russian–American program “Fundamental research and higher education” (CRDF REC-005: grant EK-005-X1 fund of the Ural Scientific Educational Center “Perspectivnie materiali”), by the Russian Foundation for Basic Research under Grant No. 07-03-00143, by the Council for Grants of the President of the Russian Federation for Support of Young Scientists (grant no. MK–84.2007.3) and ICDD Grant-in-Aid № 93-09 (2005–2006). Gunnar Svensson wants to thank the Swedish research council for financial support.
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