Synthesis, crystal structure and luminescent properties of pyrovanadates A(2)CaV(2)O(7) (A = Rb, Cs) / Zubkov Vladimir G.,Tyutyunnik Alexander P.,Tarakina Nadezda V.,Berger Ivan F.,Surat Ludmila L.,Slobodin Boris V.,Svensson Gunnar,Forslund Bertil,Shulgin Boris V.,Pustovarov Vladimir A.,Ishchenko Alexis V.,Cherepanov Alexander N. // SOLID STATE SCIENCES. - 2009. - V. 11, l. 3. - P. 726-732.

ISSN/EISSN:

1293-2558 / нет данных

Type:

Article

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 P2(1)/n with unit cell parameters: a = 13.8780(1), b = 5.96394(5), c = 10.3376(1) angstrom, beta = 104.960(1)degrees and a = 14.0713(2), b = 6.0934(1), c = 10.5944(1) angstrom, beta = 104.608(1)degrees, respectively. Their crystal structures can be described as a framework of CaO6 octahedra and V2O7 pyrogroups with alkaline metals found in the tunnels formed. Photo luminescence (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. (C) 2008 Elsevier Masson SAS. All rights reserved.

Author keywords:

Rubidium and cesium vanadium oxide; Pyrovanadates; X-ray powder diffraction; Rietveld refinement; Crystal structure; Electron diffraction; Photoluminescence; Pulse cathode luminescence SPECTRA; YVO4

DOI:

10.1016/j.solidstatesciences.2

Web of Science ID:

ISI:000264644800020

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	SPECTRA; YVO4
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical; Physics, Condensed Matter
Author-Email	tarakina@ihim.uran.ru
ResearcherID-Numbers	Tarakina, Nadezda/A-7870-2013 Tyutyunnik, Alexander/P-2230-2015
ORCID-Numbers	Tarakina, Nadezda/0000-0002-2365-861X
Funding-Acknowledgement	Russian-American program {[}CRDF REC-005]; Ural Scientific Educational Center {[}EK-005-X1]; Russian Foundation for Basic Research {[}07-03-00143]; Council for Grants of the President of the Russian Federation for Support of Young Scientists {[}MK-84.2007.3]; ICDD {[}93-09 (2005-2006)]; Swedish research council
Funding-Text	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.
Number-of-Cited-References	29
Usage-Count-Since-2013	19
Journal-ISO	Solid State Sci.
Doc-Delivery-Number	425NQ