Die Kristallstruktur von Antimon(V)-oxid

Jansen, M.

doi:10.1107/s056774087900409x

Cited by 55 publications

(27 citation statements)

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“…Although it was reported in earlier studies that ␦-V 2 O 5 is isostructural with B-Nb 2 O 5 [14], respectively Sb 2 O 5 [16], no refinement of the crystal structure was reported. We provide here the first Rietveld refinement of the crystal structure for ␦-V 2 O 5 .…”

Section: High Pressure Crystal Structuresmentioning

confidence: 63%

“…We provide here the first Rietveld refinement of the crystal structure for ␦-V 2 O 5 . The refined lattice parameters are a = 11.972Å, b = 4.702Å, c = 5.325Å and β = 104.41 • , and correspond well with the data given in former articles [14,16]. The detailed results of the refinement are given in Table 1, the atomic positions and bond lengths and angles in Appendix D. The structure is a three dimensional framework of edge and corner sharing VO 6 octahedra.…”

Section: High Pressure Crystal Structuresmentioning

confidence: 91%

“…Filonenko and Zibrov [14] performed quench experiments in a large volume press (toroidal device), up to 8.5 GPa and up to 1100 • C. In this P-T region the authors [14] found the ␤-phase up to 7.5 GPa and 900 • C and a new phase, which they have labelled B-V 2 O 5 , at 8-8.5 GPa and from 600 to 1100 • C. The authors identified this B-phase as being isostructural with Sb 2 O 5 [16] and with the B-forms of Nb 2 O 5 and Ta 2 O 5 , but with smaller lattice parameters. The return from both B-and ␤-phases into the ␣-phase at atmospheric pressure seems to be associated with strong exothermal behaviour at ≈250 and 400 • C, respectively [14].…”

Section: Introductionmentioning

confidence: 91%

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V2O5 phase diagram revisited at high pressures and high temperatures

Balog

Orosel

Čančarević

et al. 2007

Journal of Alloys and Compounds

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Section: High Pressure Crystal Structuresmentioning

confidence: 63%

Section: High Pressure Crystal Structuresmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 91%

See 1 more Smart Citation

V2O5 phase diagram revisited at high pressures and high temperatures

Balog

Orosel

Čančarević

et al. 2007

Journal of Alloys and Compounds

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“…The monoclinic phase can only be prepared under extreme conditions [38] and is metastable in aqueous solutions at ambient temperatures with respect to cubic 'antimonic acid', Sb 2 O 5 ·4H 2 O. [31] No thermochemical data are available for the latter phase and this too represents a marked gap in our knowledge of the simple chemistry of antimony.…”

Section: Solubility Issuesmentioning

confidence: 99%

Antimony in the environment: knowns and unknowns

2009

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Environmental context. Antimony first attracted public attention in the mid-1990s amid claims that it was involved in Sudden Infant Death Syndrome. A substantial number of papers have now been published on the element and its behaviour in the natural environment. However, many key aspects of the environmental chemistry of antimony remain poorly understood. These include critical areas such as its ecotoxicology, its global cycling through different environmental compartments, and what chemical form it takes in different environments. More focussed research would help the situation. The present review highlights several areas of environmental antimony chemistry that urgently need to be addressed.Abstract. The objective of the present article is to present a critical overview of issues related to the current state of knowledge on the behaviour of antimony in the environment. It makes no attempt to systematically review all published data. However, it does provide a list of the main published reviews on antimony and identifies subjects where systematic reviews are needed. Areas where our knowledge is strong -and the corresponding gaps -in subjects ranging from total concentrations and speciation in the various environmental compartments, to ecotoxicity, to cycling between compartments, are discussed, along with the underlying research. Determining total antimony no longer poses a problem for most environmental samples but speciation measurements remain challenging throughout the process, from sampling to analysis. This means that the analytical tools still need to be improved but experience shows that, to be useful in practice, this should be directly driven by the requirements of laboratory and field measurements. Many different issues can be identified where further research is required, both in the laboratory and in the field, the most urgently needed studies probably being: (i) long-term spatial and temporal studies in the different environmental compartments in order to collect the data needed to establish a global biogeochemical cycle; (ii) laboratory studies of antimony interactions with potential natural binders; (iii) reliable ecotoxicological studies. Montserrat Filella is a chemist and teaches Environmental Chemistry at the University of Geneva, Switzerland. Her main research interests focus on the understanding of the physicochemical processes regulating the behaviour of chemical components in environmental and biological compartments, mainly by combining computer modelling with field and laboratory measurements. The three main axes of her research concern the study of: colloids in natural waters, natural organic matter (quantification and interaction with trace elements) and Group 15 elements. She is also interested in other topics

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“…The crystallographic data of 1 and 2 [61], and that of ZnO and Sb 2 O 5 provided [62,67], were used for theoretical calculations. The total energy was calculated using exchange--correlation parameters of the hybrid B3LYP functional.…”

Section: Band Structures and Electronic Originations Of Shgmentioning

confidence: 99%

Structural Designs and Property Characterizations for Second-Harmonic Generation Materials

Cheng

Lin

Zhang

et al. 2012

Structure-Property Relationships in Non-Linear Optical Crystals I

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Second-harmonic generation (SHG) materials only exist in solids that have no inversion center space groups, and they are constructed by the building blocks or chromophores of noncentrosymmetricity (NCS). In this chapter, we employed one or multiple chromophores that result from the coordination structure distortions of a d 0 cation, polar displacement of d 10 cation center, a stereochemically active lone pair (SCALP) of cations, and asymmetrical delocalization p-charge systems, as building blocks to obtain some new compounds with NCS space group. The single-crystal structures were characterized, and physical properties, in particular SHG responses, were measured for these compounds. The electronic structures and density of states were calculated by DFT method, and the SHG properties are simulated to gain an insight into the relations between structure and NLO properties for the materials. The electronic origination of large SHG responses was assigned in terms of the calculated results.

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Die Kristallstruktur von Antimon(V)-oxid

Cited by 55 publications

References 1 publication

V2O5 phase diagram revisited at high pressures and high temperatures

V2O5 phase diagram revisited at high pressures and high temperatures

Antimony in the environment: knowns and unknowns

Structural Designs and Property Characterizations for Second-Harmonic Generation Materials

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