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Tungsten trioxide

Description Chemical Properties hermochromism Uses Preparation References
Tungsten trioxide
Tungsten trioxide structure
CAS No.
1314-35-8
Chemical Name:
Tungsten trioxide
Synonyms
WO3;Tung;CI 77901;Mo 100ppm;Wolframite;tungstenblue;Tungsten blue;Wolframtrioxid;TUNGSTIC OXIDE;TUNGSTEN OXIDE
CBNumber:
CB1718034
Molecular Formula:
O3W
Formula Weight:
231.84
MOL File:
1314-35-8.mol

Tungsten trioxide Properties

Melting point:
1470-1475 °C
Boiling point:
1837°C (estimate)
Density 
7.16 g/mL at 25 °C(lit.)
form 
powder
Specific Gravity
7.16
color 
Yellow to greenish-yellow
Water Solubility 
insoluble
Merck 
14,9817
InChIKey
ZNOKGRXACCSDPY-UHFFFAOYSA-N
CAS DataBase Reference
1314-35-8(CAS DataBase Reference)
FDA UNII
940E10M08M
NIST Chemistry Reference
Tungsten trioxide(1314-35-8)
EPA Substance Registry System
Tungsten trioxide (1314-35-8)
SAFETY
  • Risk and Safety Statements
Symbol(GHS) 
GHS07
Hazard statements  H302
Precautionary statements  P264-P270-P301+P312a-P330-P501a
Hazard Codes  Xn
Risk Statements  22-36/37/38
Safety Statements  26-36-37/39
WGK Germany  -
RTECS  YO7760000
21
TSCA  Yes
HS Code  28259012
NFPA 704
0
1 0

Tungsten trioxide price More Price(22)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 204781 Tungsten(VI) oxide powder, 99.995% trace metals basis 1314-35-8 10g $129 2021-03-22 Buy
Sigma-Aldrich 204781 Tungsten(VI) oxide powder, 99.995% trace metals basis 1314-35-8 50g $396 2021-03-22 Buy
Alfa Aesar 011828 Tungsten(VI) oxide 99.8% (metals basis) 1314-35-8 500g $193 2021-03-22 Buy
Alfa Aesar 011828 Tungsten(VI) oxide 99.8% (metals basis) 1314-35-8 100g $66.2 2021-03-22 Buy
Strem Chemicals 74-3105 Tungsten(VI) oxide (99.995%-W) PURATREM 1314-35-8 10g $89 2021-03-22 Buy

Tungsten trioxide Chemical Properties,Uses,Production

Description

Tungsten trioxide is a chemical compound consisting of oxygen and the transition metal tungsten. It occurs naturally but rarely in the form of hydrates in some kinds of minerals. It has various applications. In industry, it can be used for making x-ray screen phosphors, fireproofing fabrics and gas sensors as well as a pigment in ceramics and paints. It can also be used for the preparation of electrochromic windows or smart windows. In addition, it can be used in semiconductors. It, together with titanium dioxide, has the potential to become an efficient photo-catalyst under visible light irradiation. Recent study has shown that mesoporous tungsten trioxide polyaniline nanocomposite can be used as an anode material for high-performance lithium-ion batteries.

Chemical Properties

Tungsten trioxide is a bright canary-yellow coloured powder which becomes dark-orange on heating, but regains its bright yellow colour on cooling. A very slight admixture of sodium salt imparts to the oxide a greenish tint which no amount of oxidation can remove (Roscoe). It also becomes greenish on exposure to light. Tungsten trioxide has been obtained in the crystalline state by Debray, by igniting a mixture of tungstate and carbonate of sodium in a current of hydrochloric acid, when the trioxide is obtained in olive-green rectangular prisms which sublime at a white heat. The crystalline trioxide has also been prepared by heating hydrated tungstic acid with borax in a porcelain furnace (Nordenskjold). The specific gravity of tungsten trioxide thus obtained is 6.34.
Tungsten trioxide
When heated in a current of hydrogen to 250° the trioxide is converted into the blue oxidc, 2WO3+WO2 and if the heat be raised to dull redness the brown oxide, WO2 is formed, whilst at a higher temperature the metal is obtained. Acted upon by reducing agents such as zinc and hydrochloric acid, stannous chloride, or organic matter, tungsten trioxide is trans-formed successively into the blue and brown oxides.

hermochromism

hermochromism is the property of substances to changecolour due to a change in temperature and WO3is an attractive example for this property. On cooling the oxide by liquid nitrogen down to -196°C, a sudden change occurs from yellow to white, which then alters to a bluish-white colour between -50 and -27°C. At room temperature it becomes pale lemon-yellow again. On furtherheating to 200 – 300°C, WO3becomes dark yellow, changingto a deep orange colour at 400 to 500°C .
hermochromism of Tungsten trioxide
These reversible colour changes are linked to changes in the electronic properties of WO3 which alter due to changesof the internal symmetry of the WO3crystals (through alterations of the lattice arrangements).

Uses

Tungsten trioxide is a thermally stable and water insoluble tungsten compound. Tungsten trioxide andTungsten blue oxides are both used in the production of tungsten metal powders. The greatmajority of metallic tungsten is used to make cemented carbide parts, and theremainder is used in manufacturing components for lighting, electrical, electronic,heating, and welding applications; and in tool steels, alloys, catalysts, pigments, andhigh-temperature lubricants.

Preparation

Yellow tungsten trioxide is a finely divided, yellow, crystalline powder. It is produced by roasting ammonium paratungstate at closely controlled temperatures to drive off combined water and ammonia.

References

[1]Momeni, Mohamad Mohsen, and Yousef Ghayeb. "Photochemical deposition of platinum on titanium dioxide–tungsten trioxide nanocomposites: an efficient photocatalyst under visible light irradiation." Journal of Materials Science: Materials in Electronics 27.2 (2016): 1062- 1069.
[2]Li, Bin, et al. "Mesoporous Tungsten Trioxide Polyaniline Nanocomposite as an Anode Material for High‐Performance Lithium‐ Ion Batteries."ChemNanoMat 2.4 (2016): 281-289.
[3]Hunge, Y. M., et al. "Photoelectrocatalytic degradation of methyl blue using sprayed WO3 thin films." Journal of Materials Science: Materials in Electronics 27.2 (2016): 1629-1635.
[4]Albalshi, Madleen Ahmad Mohammad. Electrochemical properties of Sol-gel WO3 films Co-doped with Ti and Zn. Diss. 2016.

Chemical Properties

Canary-yellow, heavy powder, darkorange when heated and regains original color on cooling. Insoluble in water, soluble in caustic alkalies, soluble with difficulty in acids. Noncombustible.

Physical properties

Heavy yellow powder; turns dark orange on heating; reverts back to yellow on cooling; density 7.2 g/cm3; melts at 1,472°C; insoluble in water; slightly soluble in acids; soluble in caustic alkalies.

Uses

manufacture of tungstates which are used for x-ray screens and for fireproofing fabrics.

Uses

Tungsten oxide (WO3) is used to make tungsten alloys. Tungsten oxide is also used as fireproofing for various surfaces and is used as a yellow pigment in ceramics.

Preparation

Tungsten trioxide is obtained as an intermediate in recovery of tungsten from its minerals (See Tungsten). In commerical processes tungstic acid, H2WO4, obtained from the mineral scheelite, may either be decomposed at high temperatures to form trioxide or dissolved in ammonium hydroxide solution and evaporated to yield ammonium paratungstate (APT) crystals, 5 (NH4)2O?12WO3?11H2O. The APT crystals are then washed, dried, and calcined at elevated temperatures to form tungsten trioxide
Tungsten trioxide, in general, can be made by heating metallic tungsten, its carbides, its lower oxides, or tungstic acid in air.

Hazard

Toxic material.

Safety Profile

Moderately toxic by ingestion. Can react violently with ClF3, Li, Cl2. See also TUNGSTEN COMPOUNDS.

Tungsten trioxide Preparation Products And Raw materials

Raw materials

Preparation Products


Tungsten trioxide Suppliers

Global( 228)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Anhui Royal Chemical Co., Ltd.
+86-025-86655873
marketing@royal-chem.com CHINA 536 55
Henan DaKen Chemical CO.,LTD.
+86-371-66670886
info@dakenchem.com China 20907 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 22607 55
Hangzhou FandaChem Co.,Ltd.
008615858145714
+86-571-56059825 fandachem@gmail.com CHINA 8909 55
career henan chemical co
+86-371-86658258
sales@coreychem.com CHINA 29954 58
SHANDONG ZHI SHANG CHEMICAL CO.LTD
+86 18953170293
+86 0531-67809011 sales@sdzschem.com CHINA 2941 58
Hubei Jusheng Technology Co.,Ltd.
86-18871470254
027-59599243 linda@hubeijusheng.com CHINA 28229 58
Chongqing Chemdad Co., Ltd
+86-13650506873
sales@chemdad.com CHINA 37282 58
TopScience Biochemical
00852-68527855
00852-26406298 info@itopbiochem.com China Hong Kong 904 58
Shaanxi Dideu Medichem Co. Ltd
13772537765
029-88380327 1010@dideu.com CHINA 3993 58

View Lastest Price from Tungsten trioxide manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-07-20 Tungsten trioxide
1314-35-8
US $0.00-0.00 / KG 10mg 99% 2000tons Shaanxi Dideu Medichem Co. Ltd
2019-07-06 Tungsten trioxide
1314-35-8
US $1.00 / kg 1kg 99% Customized career henan chemical co

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