Electrical Properties of Tungsten Trioxide Films

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Category: Tungsten Information
Published on Monday, 02 February 2015 17:31
Written by cq
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Selectively doped semiconducting metal oxide (SMO) films have been shown to have applications as the sensing element in gas microsensors. Critical to the design and operation of these sensors is the SMO film. The electrical properties of both intrinsic and extrinsic (doped with gold) tungsten trioxide (WO3) films, which selectively sorb hydrogen sulfide (H2S), are investigated. Hall effect measurements are performed as a function of film thickness, temperature, gold-doping concentration, and H2S gas concentration. The conductivity was found to be n type and strongly dependent on temperature, gold doping concentration, and H2S gas concentration and less dependent on film thickness. The mobility was relatively high while the intrinsic carrier concentration was low when compared to typical semiconductor materials. The conductivity was shown to exhibit anomalous behavior at certain temperatures and H2S gas concentrations.
 
 
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Tungsten Oxide Powder Typical Applications and Packaging

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Category: Tungsten Information
Published on Monday, 02 February 2015 17:27
Written by cq
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Tungsten Oxide Powder Typical Applications:
Used in the manufacture of tungsten and tungstates, in alloys, in fire-proofing fabrics and as a ceramic pigment.
 
Tungsten Oxide Powder Packaging:
Jars, pails, drums, multiply paper bags, bulk bags and fiberboard containers. For further information on packaging options contact Chinatungsten Online.
 
 
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What the Difference of the Ammoniu Metatungstate and Ammonium Paratungstate ?

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Category: Tungsten Information
Published on Monday, 02 February 2015 17:16
Written by zsq
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The thermal decomposition of ammonium paratungstate tetrahydrate (APT·4H2O), (NH4)10[H2W12O42]·4H2O, in air to tungsten trioxide, WO3, was investigated under non-isothermal conditions using thermal analysis coupled on-line by a Skimmer® system to a quadrupole mass spectrometer (TA-MS) for evolved gas analysis (EGA), with X-ray powder diffraction (XRD), with Fourier

Read more: What the Difference of the Ammoniu Metatungstate and Ammonium Paratungstate ?

Tungsten Oxide Powder

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Category: Tungsten Information
Published on Monday, 02 February 2015 17:17
Written by cq
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Tungsten Oxide Powder Synonyms:
tungsten oxide, tungsten(IV) oxide (WO2), tungsten(VI) oxide (WO3), tungsten trioxide, tungsten(VI) trioxide, tungstic anhydride, CAS#1314-35-8  (WO3), ditungsten pentaoxide, tetratungsten undecaoxide, tungsten oxide, tungsten oxide (W2O5), scheelite, wolframite, ferberitetungsten oxide (W4O11)
 
Chemical Names:
Tungsten oxide, Tungsten trioxide, Tungsten (VI) trioxide
 
Chemical Formulas:
W2O5, WO2 and WO3
 
Tungsten Oxide Powder Description:
Tungsten oxide is obtained from the minerals scheelite, wolframite, ferberite. It is insoluble in H2O and acids, but soluble in hot alkalis.
 
Tungsten Oxide Powder Chemical Properties Available:
99.9% up to 99.99%
 
Tungsten Oxide Powder Physical Properties Available:
Targets, pieces, and powder to customer specifications
 
 
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Preparation of Tungsten Trioxide

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Category: Tungsten Information
Published on Monday, 02 February 2015 17:11
Written by cq
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Tungsten trioxide can be prepared in several different ways. CaWO4, or scheelite, is allowed to react with HCl to produce tungstic acid, which decomposes to WO3 and water at high temperatures.
 
CaWO4 + 2 HCl → CaCl2 + H2WO4
H2WO4 → H2O + WO3
 
Another common way to synthesize WO3 is by calcination of ammonium paratungstate (APT) under oxidizing conditions:
 
(NH4)10[H2W12O42]•4H2O → 12 WO3 + 10 NH3 + 10 H2O
 
 
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More Articles...

  1. History of Tungsten Trioxide
  2. Some Techniques Used to Ammonium Metatungstate
  3. A New Production Method of Pure Ammonium Metatungstate
  4. The Thermal Decomposition of Ammoniu Metatungstate
 

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