7787-42-0

Basic information

• Product Name: BARIUM TUNGSTATE
• Synonyms: BARIUM TUNGSTATE;BARIUM TUNGSTATE(+4);BARIUM TUNGSTATE (PARA);BARIUM TUNGSTEN OXIDE;(beta-4)-tungstate(wo42-barium(1:1);barium wolframate, not of a kind used as a luminophore;Bariumtungstateopticalgradewhitepowder;BARIUM TUNGSTATE, -100 MESH, 99.9%
• CAS NO: 7787-42-0
• Molecular Formula: BaO4W
• Molecular Weight: 385.16
• EINECS: 232-114-3
• Product Categories: BariumMetal and Ceramic Science;Catalysis and Inorganic Chemistry;Ceramics;Chemical Synthesis;TungstatesChemical Synthesis;Tungsten
• Mol File: 7787-42-0.mol
• Article Data: 28

Chemical Properties

• Appearance: /white tetragonal crystals
• Density: 5.04 g/mL at 25 °C(lit.)
• Water Solubility: insoluble H2O [HAW93]
• CAS DataBase Reference: BARIUM TUNGSTATE(CAS DataBase Reference)
• NIST Chemistry Reference: BARIUM TUNGSTATE(7787-42-0)
• EPA Substance Registry System: BARIUM TUNGSTATE(7787-42-0)

Safety Data

• Hazard Codes: Xn
• Statements: 20/22
• Safety Statements: 28
• WGK Germany: 1
• Hazardous Substances Data: 7787-42-0(Hazardous Substances Data)

Usage

Description

Barium tungstate, also known as barium wolframate, is an inorganic chemical compound with the formula BaWO4. It is a white crystalline solid that exhibits unique luminescent and dielectric properties, making it a versatile material for various applications.

Uses

Used in Pigment Industry:
Barium tungstate is used as a pigment in various applications due to its bright white color and opacity.
Used in X-ray Photography:
Barium tungstate is used in the manufacturing of intensifying and phosphorescent screens for X-ray photography, as it exhibits strong luminescence properties when exposed to X-ray radiation.
Used in Luminescence Investigations:
Barium tungstate is used as a subject of research for its luminescence properties, which can be applied in the development of new materials and technologies.
Used in Antimonate Photocatalysts:
Barium tungstate is used in the synthesis of antimonate photocatalysts, which have potential applications in environmental remediation and energy production.
Used in Dielectric and Tunable Characteristics of Composite Ceramics:
Barium tungstate is used in the development of composite ceramics with dielectric and tunable characteristics, which can be applied in microwave devices and communication systems.
Used in Nanohybrid Synthesis and Luminescence:
Barium tungstate is used in the synthesis of nanohybrids and the investigation of their luminescence properties, which can lead to advancements in optoelectronic devices and sensors.
Used in Electrochemical Synthesis:
Barium tungstate is used in the electrochemical synthesis of crystals, which can be applied in various fields, including electronics, optics, and materials science.
Used as a Reactant for Ammonolysis:
Barium tungstate is used as a reactant in the ammonolysis process to produce oxynitride compounds, which have potential applications in various industries, such as ceramics and glass manufacturing.

InChI:InChI=1/Ba.4O.W/q+2;;;2*-1;/rBa.O4W/c;1-5(2,3)4/q+2;-2

Upstream product

• 10213-10-2 sodium tungstate (VI) dihydrate 
• 10361-37-2 barium(II) chloride dihydrate 

Relevant articles and documents

Microstructure and microwave dielectric properties of Ba5Nb4O15-BaWO4 composite ceramics

Microwave dielectric composite ceramics with compositions of (1 - x)Ba5Nb4O15-xBaWO4 (x = 0-1) were prepared by firing the mixture of Ba5Nb4O15 and BaWO4. The sinterin

Low-temperature properties of BaWO4 based on experimental heat capacity in the range 5.7–304u202fK

The heat capacity of barium tungstate single crystal was measured by the adiabatic method in the range of 5.7–304 K. No anomalies in the heat capacity associated with the phase transition were found. The analysis of the functional behavior of heat capacity near zero revealed a low-frequency peak in the phonon density of states of BaWO4. An approach was proposed to allow quantitative description of the acoustic wing of the phonon density of states. The approximation of experimental data by an analytical expression was done, including the temperature region near 0 K. The Debye temperature at absolute zero has been obtained. The thermodynamic functions were calculated: entropy, enthalpy increment and Gibbs free energy.

Low-temperature induced phase transitions in BaWO4:Er3+ microcrystals: A Raman scattering study

The synthesis of rare-earth-doped barium tungstate has increased in recent decades due to the attractive electrical and optical properties of the material. In this study, erbium-doped barium tungstate was synthesized by the co-precipitation method with three different concentrations: Ba(1-x)ErxWO4 (where x = 0.00, 0.01, and 0.02). The materials were characterized by X-ray diffraction (XRD), Raman and Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS). Subsequently, the samples were subjected to temperature variations in the range of 123–293 K, and their Raman spectra were collected to observe the structural changes induced by Er doping. We observed that at low temperatures, there was no indication of phase transition for pure tungstate (BaWO4); however, for doped tungstates, changes were observed in the Raman spectra, showing an unexpected structural phase transition.

Dielectric and tunable characteristics of Ba0.4Sr 0.6TiO3-BaWO4 composite ceramics for microwave applications

Phase compositions, microstructure and microwave dielectric properties, of BaWO4 (BW)-Ba0.4Sr0.6TiO3 (BST) composite ceramics, prepared by the traditional solid-state route, were systematically characterized. Meanwhile, mechanism of dielectric tunability of those materials was discussed. Dielectric properties of the BW-BST composites at a DC bias field near the phase transition temperature could be interpreted by using Johnson's phenomenological equation. The sample with x = 0.60 exhibited a tunability of 29.5%, a dielectric permittivity of 192 and a Q value of 231 (at 2.700 GHz), which make it a promising candidate for applications in electrically tunable microwave devices.

Visible light photocatalytic degradation of crystal violet dye and electrochemical detection of ascorbic acid & glucose using BaWO4 nanorods

Barium tungstate (BaWO?) rod like nanostructures were synthesized by slightly modified hydrothermal technique using sodium tungstate dihydrate (Na2WO?. 2H2O) as tungstate ion source and barium nitrate [Ba(NO?)?] as barium ion source.

Luminescent properties under X-ray excitation of Ba(1?x)PbxWO4 disordered solid solution

A series of polycrystalline barium-lead tungstate Ba1-xPbxWO4 with 0 ≤ x ≤ 1 was synthesized using a classical solid-state method with thermal treatment at 1000 °C. These materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Raman (FT-Raman) spectroscopy. X-ray diffraction profile analyses were performed using Rietveld method. These materials crystallized in the scheelite tetragonal structure and behaved as quasi ideal solid solution. Raman spectroscopy confirmed the formation of the solid solution. Structural distortions were evidenced in X-ray diffraction profiles and in vibration Raman spectra. The scanning electron microscopy experiments showed large and rounded irregular grains. Luminescence experiments were performed under X-ray excitation. The luminescence emission profiles have been interpreted in terms of four Gaussian components, with a major contribution of blue emission. The integrated intensity of luminescence reached a maximum value in the composition range x = 0.3–0.6, in relation with distortions of crystal lattice.

Polymer-directed synthesis of penniform BaWO4 nanostructures in reverse micelles

Novel penniform superstructures of BaWO4 nanowires have been successfully synthesized in catanionic reverse micelles by using a double-hydrophilic block copolymer as the directing agent. This synthetic method is very simple, mild, and controllable, and it provides a novel method for direct solution-growth of hierarchical nanostructures based on inorganic nanowires. Copyright

General, room-temperature method for the synthesis of isolated as well as arrays of single-crystalline ABO4-type nanorods

Single-crystalline BaWO4 and BaCrO4 nanorods of reproducible shape and of varying sizes have been controllably prepared using a simple, room-temperature approach, based on the use of porous alumina template membranes. Aligned BaWO4 and BaCrO4 nanorod arrays can be obtained by dissolving the template. Our facile technique, which is analogous to biomineralization, offers a promising and generalized methodology to prepare other types of free-standing ABO4 nanorods and their corresponding nanorod arrays. Extensive characterization of these samples has been performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), selected area electron diffraction (SAED), Raman spectroscopy, FT-infrared spectroscopy (FT-IR), and X-ray diffraction (XRD).

Serendipitous discovery of super adsorbent properties of sonochemically synthesized nano BaWO4

The superior adsorbent properties of BaWO4 nanostructures have been reported for the first time. Flower shaped aggregates (～250 nm) of BaWO4 nanoparticles, having an average size of ～10-15 nm with a high surface area of ～148.0 ± 0.2 m2 g-1, have been synthesized sonochemically and used for the adsorption of various cationic dyes from aqueous solutions. The sonochemically synthesized BaWO4 have been characterized by scanning electron microscopy (SEM), selected area electron diffraction (SAED), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The adsorbent capacity of this tungstate is much higher than that reported for other nanomaterials like Fe2O3, MnO2, WO3, etc. Complete removal of dyes like rhodamine B and methylene blue was possible within a short time span of 10-15 minutes. The adsorption process was followed using UV-Visible spectroscopy, while the material before and after adsorption has been characterized using physicochemical and spectroscopic techniques. Various isotherms have been used to fit the data, and kinetic parameters were evaluated. Moreover, the adsorbed dyes could be desorbed completely from nanoparticle surfaces by annealing at moderate temperature and were found to be efficient for multicyclic use. Thus this sonochemically synthesized nano BaWO4 has great significance in treatment of dye industry effluents as a promising adsorbent for cationic dyes from aqueous solution. The Royal Society of Chemistry 2013.