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• W2034943745 abstract "Structural, luminescence, and electronic properties of the family of alkaline metal-strontium cyclotetravanadates ${M}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$, $M=mathrm{Na}$, K, Rb, and Cs have been characterized by means of elemental analyses, x-ray powder diffraction, neutron diffraction, electron diffraction, infrared, Raman, photo, x rays, pulse cathode beam excitation, x-ray photoelectron spectroscopy and band structure calculations. The ${M}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ system have tetragonal structures Na-, K-, $mathrm{Rb}text{ensuremath{-}}P4∕nbm$ and $mathrm{Cs}text{ensuremath{-}}P4∕mmm$, with $a=10.63449(4)$, 10.94106(6), 11.08889(8), 7.9183(3) and $c=4.96205(4)$, 5.31600(4), 5.46682(8), $5.5778(3)phantom{rule{0.3em}{0ex}}mathrm{AA{}}$, respectively. The main structural feature of ${M}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ is tetracyclic $[{mathrm{V}}_{4}{mathrm{O}}_{12}]$ units. When going from ${mathrm{Na}}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ to ${mathrm{Cs}}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ do the coordination polyhedron around the alkaline metal change continuously from an octahedron to a hexagonal prism and that around the strontium from a square antiprism to a square prism. The hybridized O $2ptext{ensuremath{-}}mathrm{V}$ $3d$ states of tetracyclic $[{mathrm{V}}_{4}{mathrm{O}}_{12}]$ units have a dominant influence on the electronic structure of these compounds. All ${M}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ are semiconducting with a decreasing LDA band gap $({E}_{a})$ from 2.02 for ${mathrm{Na}}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$ to $1.56phantom{rule{0.3em}{0ex}}mathrm{eV}$ for ${mathrm{Cs}}_{2}mathrm{Sr}{(mathrm{V}{mathrm{O}}_{3})}_{4}$." @default.
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• W2034943745 date "2005-10-21" @default.
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• W2034943745 title "Structural, luminescence, and electronic properties of the alkaline metal-strontium cyclotetravanadates<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi>M</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>Sr</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant=normal>V</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>4</mml:mn></mml:msub></…" @default.
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• W2034943745 doi "https://doi.org/10.1103/physrevb.72.155205" @default.
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