Journal ArticleDOI
Crystal data and nuclear quadrupole resonance spectra of tetra-arsenic triselenide
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TLDR
In this article, As4Se3 was synthesized and isolated in two polymorphs of which α-As-Se3 is isostructural with α-Se2Se3 and β-As4Se2 is monoclinic, space group C2/c or Cc.Abstract:
Tetra-arsenic triselenide, As4Se3, has been synthesized and isolated in two polymorphs of which α-As4Se3 is isostructural with α-As4Se3. It is orthorhombic, space group Pnma, with Z= 4, in a unit cell of dimensions a= 9.46(2), b= 7.97(2), c= 10.47 (2)A. The 75As n.q.r. spectrum at 77 K shows three resonances with intensities 1 : 2 : 1 at 60.78 and 61.07 MHz due to the basal As and at 68.97 due to the apical As of the As4Se3 molecule. The polymorph β-As4Se3 is monoclinic, space group C2/c or Cc, with Z= 16 in a unit cell of dimensions a= 25.62(5), b= 6.52(2), c= 23.01(5)A, β= 126.6 ± 0.5°. Its n.q.r. spectrum at 77 K shows a number of incompletely resolved lines between 57.5 and 61.0 MHz and between 69.5 and 71.5 MHz, associated with basal and apical As atoms of the As4Se3 molecule.read more
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Journal ArticleDOI
A crystallographic review of arsenic sulfides : effects of chemical variations and changes induced by exposure to light
Paola Bonazzi,Luca Bindi +1 more
TL;DR: The results of recent studies dealing with the effects of the exposure of realgar or other arsenic sulfides to visible light are reported and discussed as mentioned in this paper, with some examples of application.
Journal ArticleDOI
Neutron studies of an inorganic plastic glass
Adrian C. Wright,Bruce G. Aitken,Gabriel J. Cuello,Richard Haworth,Roger N. Sinclair,J. Ross Stewart,Jon W. Taylor +6 more
TL;DR: In this paper, the authors performed a neutron diffraction investigation of the structure of four chalcogenide glasses, using the D4c diffractometer on the high-flux reactor at the Institut Laue-Langevin (ILL).
Journal ArticleDOI
77Se solid-state NMR of As2Se3, As4Se4 and As4Se3 crystals: a combined experimental and computational study
Kateryna Sykina,Guang Yang,Claire Roiland,Laurent Le Pollès,Eric Le Fur,Chris J. Pickard,Bruno Bureau,Eric Furet +7 more
TL;DR: Calculations performed on several molecules derived from the crystal structures have demonstrated the limited effect of interlayer or intermolecular interactions on the isotropic chemical shifts and show that the structure of As4Se3 should be reinvestigated using state-of-the-art diffraction techniques.
Journal ArticleDOI
Description of the Cu-As-Se ternary system
TL;DR: The phase diagram of the Cu-As-Se ternary system was studied by differential thermal analysis, X-ray diffraction and metallography analysis as mentioned in this paper, and two ternaries phases are observed: the Cu 3 AsSe 4 compound, which melts congruently, and the CuAsSe 2 compound, undergoing a peritectic decomposition.
Journal ArticleDOI
Standard molar enthalpies of formation and transition at the temperature 298.15 K and other thermodynamic properties of the crystalline and vitreous forms of arsenic sesquiselenide (As2Se3). Dissociation enthalpies of AsSe bonds
TL;DR: In this article, the standard molar enthalpies of As2Se3 and As4Se4(g) were determined at the temperature 298.15 K and with standard pressure po = 101.325 kPa.
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