Structure of binary alkaline earth vanadate glasses: An x-ray and neutron diffraction investigation

U. Hoppe; R. Kranold; J. M. Lewis; C. P. O'Brien; H. Feller; S. Feller; M. Affatigato; J. Neuefeind; A. C. Hannon

Structure of binary alkaline earth vanadate glasses: An x-ray and neutron diffraction investigation

U. Hoppe, R. Kranold, J. M. Lewis, C. P. O'Brien, H. Feller, S. Feller, M. Affatigato, J. Neuefeind, A. C. Hannon

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Structural changes in a series of calcium vanadate glasses with molar ratios R=n(CaO)/n(V₂O₅) from 0.3 to 1.5 and of Sr and Ba vanadate glasses of selected compositions are studied by x-ray and neutron diffraction experiments. A significant decrease of the total V-O coordination number from 4.5±0.1 to 3.9±0.1 is observed with increasing CaO fractions. In this process the three dimensional network formed of VO ₅ and VO₄ units is transformed to chains of VO₄ units where the VO_n groups are mainly linked by corners. The Ca-O coordination numbers of ∼6.5+0.5 of the Ca-O first neighbour peaks at 0.241 nm are independent of composition. Different front the x-ray structure factors of the Ca and Sr metavanadate glasses R=1 that of the corresponding Ba metavanadate glass shows a prepeak. Also the mean V-V first neighbour distance of this Ba glass is longer (∼0.35 nm) than those of the Ca and Sr metavanadate glasses (∼0.33 nm).

Original language	English
Pages (from-to)	272-279
Number of pages	8
Journal	Physics and Chemistry of Glasses
Volume	44
Issue number	4
State	Published - Aug 2003
Externally published	Yes

Cite this

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title = "Structure of binary alkaline earth vanadate glasses: An x-ray and neutron diffraction investigation",

abstract = "Structural changes in a series of calcium vanadate glasses with molar ratios R=n(CaO)/n(V2O5) from 0.3 to 1.5 and of Sr and Ba vanadate glasses of selected compositions are studied by x-ray and neutron diffraction experiments. A significant decrease of the total V-O coordination number from 4.5±0.1 to 3.9±0.1 is observed with increasing CaO fractions. In this process the three dimensional network formed of VO 5 and VO4 units is transformed to chains of VO4 units where the VOn groups are mainly linked by corners. The Ca-O coordination numbers of ∼6.5+0.5 of the Ca-O first neighbour peaks at 0.241 nm are independent of composition. Different front the x-ray structure factors of the Ca and Sr metavanadate glasses R=1 that of the corresponding Ba metavanadate glass shows a prepeak. Also the mean V-V first neighbour distance of this Ba glass is longer (∼0.35 nm) than those of the Ca and Sr metavanadate glasses (∼0.33 nm).",

author = "U. Hoppe and R. Kranold and Lewis, {J. M.} and O'Brien, {C. P.} and H. Feller and S. Feller and M. Affatigato and J. Neuefeind and Hannon, {A. C.}",

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language = "English",

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T2 - An x-ray and neutron diffraction investigation

AU - Hoppe, U.

AU - Kranold, R.

AU - Lewis, J. M.

AU - O'Brien, C. P.

AU - Feller, H.

AU - Feller, S.

AU - Affatigato, M.

AU - Neuefeind, J.

AU - Hannon, A. C.

PY - 2003/8

Y1 - 2003/8

N2 - Structural changes in a series of calcium vanadate glasses with molar ratios R=n(CaO)/n(V2O5) from 0.3 to 1.5 and of Sr and Ba vanadate glasses of selected compositions are studied by x-ray and neutron diffraction experiments. A significant decrease of the total V-O coordination number from 4.5±0.1 to 3.9±0.1 is observed with increasing CaO fractions. In this process the three dimensional network formed of VO 5 and VO4 units is transformed to chains of VO4 units where the VOn groups are mainly linked by corners. The Ca-O coordination numbers of ∼6.5+0.5 of the Ca-O first neighbour peaks at 0.241 nm are independent of composition. Different front the x-ray structure factors of the Ca and Sr metavanadate glasses R=1 that of the corresponding Ba metavanadate glass shows a prepeak. Also the mean V-V first neighbour distance of this Ba glass is longer (∼0.35 nm) than those of the Ca and Sr metavanadate glasses (∼0.33 nm).

AB - Structural changes in a series of calcium vanadate glasses with molar ratios R=n(CaO)/n(V2O5) from 0.3 to 1.5 and of Sr and Ba vanadate glasses of selected compositions are studied by x-ray and neutron diffraction experiments. A significant decrease of the total V-O coordination number from 4.5±0.1 to 3.9±0.1 is observed with increasing CaO fractions. In this process the three dimensional network formed of VO 5 and VO4 units is transformed to chains of VO4 units where the VOn groups are mainly linked by corners. The Ca-O coordination numbers of ∼6.5+0.5 of the Ca-O first neighbour peaks at 0.241 nm are independent of composition. Different front the x-ray structure factors of the Ca and Sr metavanadate glasses R=1 that of the corresponding Ba metavanadate glass shows a prepeak. Also the mean V-V first neighbour distance of this Ba glass is longer (∼0.35 nm) than those of the Ca and Sr metavanadate glasses (∼0.33 nm).

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JO - Physics and Chemistry of Glasses

JF - Physics and Chemistry of Glasses

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Structure of binary alkaline earth vanadate glasses: An x-ray and neutron diffraction investigation

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