Vanadium Compounds - Oral

Project ID

2357

Category

IRIS

Added on

March 13, 2015, 11:04 a.m.

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3713 items found. Displaying 25 items on page 2 of 149.

PubMed
DOI WoS
Journal Article

Synthesis, Crystal Structure, and Optical Characterization of the Sulfide Chloride Oxide CsBa6V4S12ClO4 with a Near-Infrared Fluorescence

Valldor M et al. 2019

Abstract  When CsCl, BaS, BaO, V, and S are reacted in a solid-state reaction under inert conditions, pure powders and single crystals of senary CsBa6V4S12ClO4 can be obtained. Its unique crystal structure has the symmetry R3̅H (no. 148) and unit cell parameters a = 9.0575(2) and c = 28.339(1) Å. The crystal structure contains polar units [VS3O]3- and a complex BaS7ClO2 coordination. The compound gets its deep-red color from a low-energy charge transfer, which can be explained by an electron transfer from S2- to V5+. In the near-infrared range, down-converted fluorescence occurs at 1.06 and 0.90 eV, and both emissions appear <450 ps after excitation at about 1.27 eV.

PubMed
DOI WoS
Journal Article

Discoloration Effect and One-Step Synthesis of Hydrogen Tungsten and Molybdenum Bronze (H x MO3) using Liquid Metal at Room Temperature

Cui Y et al. 2019

Abstract  This paper presents a new route to one-step fabrication and in situ application of hydrogen tungsten and molybdenum bronze (H x MO3) at room temperature and triggers the interdisciplinary research of multifunctional materials between liquid metal and transition-metal oxides (TMOs). Gallium-based liquid metal (GBLM) enables the discoloration effect on TMOs in acid electrolytes at ambient temperature. The underlying mechanism behind this phenomenon can be ascribed to the redox effect at the interface of liquid metal and TMOs in acid electrolytes. Both the theoretical calculations and the experimental results demonstrate that the increasing intercalation of H+ ions into the lattice of WO3 raises the electron density at the Fermi level and charge carriers. H+ ion content in the obtained H x MO3 can be controlled in our approach to meet different requirements. Taking advantage of the one-step fabrication and room-temperature liquid phase nature of the liquid metal, H x MO3 is synthesized under ambient conditions in a very short time, which is inaccessible with conventional solution-processed mechanical alloying, or other methods. The H x MO3 obtained in this one-step approach enables convenient and simple applications for biomimetic camouflage, cost-effective energy storage, H+ ion sensor, and electronic switch.

PubMed
DOI WoS
Journal Article

Ferromagnetic van der Waals Crystal VI3

Tian S et al. 2019

Abstract  We report structural properties, physical properties, and the electronic structure of van der Waals (vdW) crystal VI3. Detailed analysis reveals that VI3 exhibits a structural transition from monoclinic C2/ m to rhombohedral R3̅ at Ts ≈ 79 K, similar to CrX3 (X = Cl, Br, I). Below Ts, a long-range ferromagnetic (FM) transition emerges at Tc ≈ 50 K. The local moment of V in VI3 is close to the high-spin state V3+ ion ( S = 1). Theoretical calculations suggest that VI3 may be a Mott insulator with a band gap of about 0.90 eV. In addition, VI3 has a relatively small interlayer binding energy and can be exfoliated easily down to a few layers experimentally. Therefore, VI3 is a candidate for two-dimensional FM semiconductors. It also provides a novel platform to explore 2D magnetism and vdW heterostructures in S = 1 system.

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