The structure of densified As2O3 glasses

Ordered helium trapping and bonding in compressed arsenolite: Synthesis ofAs4O6·2He

“…S1 in Supplemental Material [27]). This feature can be ascribed to the onset of pressure-induced amorphization (PIA), as previously reported [21]. Comparison of XRD patterns of samples before and after compression reveal that recovered samples do not exhibit a good crystalline quality after the pressure cycle, which also suggests PIA of arsenolite.…”

“…High-pressure (HP) Raman scattering (RS) and HP Fourier transform infrared measurements of arsenolite [20]; HP RS measurements of arsenolite, claudetite, and glass [21,22]; and HP x-ray diffraction (XRD) studies of arsenolite, claudetite, and glass As 2 O 3 [21][22][23][24] have been published. On the other hand, the atomic structure of arsenolite and its equation of state under different pressure transmitting media (PTM) were firstly reported in Ref.…”

Compressibility and vibration modes of the supramolecular compound assembly from arsenic vanadates and [Co(H2O)6]2+ cations

“…A. Grzechnik reported that the structural of As 4 O 6 changed at about pressure 6~8 GPa, and the distortion of the As 4 O 6 crystal lattice is associated with the perturbations of the molecular environment but not with significant, if any, relative displacements of the As and/or O atoms [4]. However, [3] Mei reported that the AsO 3 pyramids in vAs 2 O 3 are relatively rigid and the 3-membered rings remain intact after compaction at high pressure. The densified samples exhibit only a very slight elongation of the As-O bond and hardly any change in the As-As distance between Further analysis of the pressure-induced changes in VO 5 pyramids could be based on the fivefold coordination of vanadium with oxygen in V 2 O 5 , which is described as made up of chains of edge-sharing VO 5 square pyramids as shown in Fig.…”

“…Vitreous As 2 O 3 is composed of a random network of corner shared AsO 3 pyramids based on comparison of quasi-crystalline and random models. The AsO 3 pyramids were rather rigid under pressures [3]. The 3-membered rings in the glass remain intact after compaction at high pressure because only a slight elongation of the As-O bond and hardly any change in the As-As distance between AsO 3 pyramids in compressed samples of vAs 2 O 3 .…”

“…In all the V 2 O 5 -based systems, the V 5+ cations are partially reduced to a V 4+ valence state, and the semiconducting properties arise from the electron hopping between the V 5+ and V 4+ cations, change in response to the pressure-induced structural transformations. While, the AsO 3 pyramids are assembled together to form As 2 O 3 polymorphs [3] and adamantane structured As 4 O 6 molecular units [4], respectively. Vitreous As 2 O 3 is composed of a random network of corner shared AsO 3 pyramids based on comparison of quasi-crystalline and random models.…”