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• W3037974004 endingPage "155918" @default.
• W3037974004 startingPage "155918" @default.
• W3037974004 abstract "Pure and Tm 3+ -doped Ca 3 (VO 4 ) 2 crystals (CVO and CVO:Tm) were grown by the Czochralski method. Activator ions were introduced in the form of Tm 2 O 3 (0.5 and 1.0 wt%) over CVO stoichiometry. The single-crystal X-ray diffraction analysis revealed for the first time the actual crystal compositions with a splitting of one Ca5 site into two, Ca5 and Ca5 A , defective sites and a partial occurrence of Tm 3+ ions in two, Ca3 and Ca4, sites. X-ray absorption spectroscopy showed that the Tm 3+ ions have octahedral coordination with an additional oxygen atom (coordination number, 6 + 1) and the V 5+ ions have tetrahedral coordination (coordination number, 4). The structure of CVO:Tm crystals is proposed based on the local structure of Tm 3+ ions, taking into account their structural organization in Tm 2 O 3 and structural features of the CVO crystal matrix. Spectral-luminescent properties of CVO:1.0 wt%Tm crystal are consistent with structural results obtained: two pronounced peaks at λ = 470.5 and 473.5 nm in the absorption spectra (77 K), two different fluorescence spectra for different excitation wavelengths, and two components with significantly different lifetimes (1380 and 370 μs) in the decay curves indicate the presence of two different Tm 3+ optical centers in the Ca 3 (VO 4 ) 2 crystal with excellent spectroscopic properties. • Pure and Tm-doped Ca 3 (VO 4 ) 2 crystals were grown by the Czochralski method. • X-ray diffraction revealed a splitting of Ca5 site into two defective sites. • The Tm 3+ ions partially occupy two, Ca3 and Ca4, crystallographic sites. • The Tm 3+ ions have octahedral coordination with an additional oxygen atom. • The Tm-doped Ca 3 (VO 4 ) 2 demonstrate excellent spectral-luminescent properties." @default.
• W3037974004 created "2020-07-02" @default.
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• W3037974004 date "2021-02-01" @default.
• W3037974004 modified "2023-09-24" @default.
• W3037974004 title "Pure and Tm3+-doped Ca3(VO4)2 crystals: Growth, statistical and local structure, and luminescent properties" @default.
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• W3037974004 doi "https://doi.org/10.1016/j.jallcom.2020.155918" @default.
• W3037974004 hasPublicationYear "2021" @default.
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