Study on Tungsten Oxide Nanorods
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 17:35
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Electrical Properties of Tungsten Trioxide Films
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 17:31
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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
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Tungsten Oxide Powder
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 17:17
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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
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
Preparation of Tungsten Trioxide
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 17:11
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History of Tungsten Trioxide
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 17:05
Tungsten has a rich history dating back to its discovery during the 18th century. Peter Woulfe was the first to recognize a new element in the naturally occurring mineral wolframite. Tungsten was originally known as wolfram, explaining the choice of "W" for its elemental symbol. Swedish chemist Carl Wilhelm Scheele contributed to its discovery as well with his studies on the mineral scheelite.
In 1841, a chemist named Robert Oxland gave the first procedures for preparing tungsten trioxide and sodium tungstate.He was granted patents for his work soon after, and is considered to be the founder of systematic tungsten chemistry.
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Some Techniques Used to Ammonium Metatungstate
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 16:51
Several techniques have been used to study the structure of the Keggin-type polyoxometalate salt ammonium metatungstate(AMT)—(NH4)6[H2W12O40]*nH2O, a potential fuel cell catalyst. The dehydrated salt is comprised of a mixture of crystallites of different unit cells in a centered eutactic cubic configuration, with an average unit cell of a≅12.295. Varied orientations of the Keggin ions in the cubic arrangement create the differences, and orientational variation within each unit cell size represents an energy well.
A New Production Method of Pure Ammonium Metatungstate
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 15:48
Using a coupling process of neutralization–nanofiltration–crystallization, pure is producted . The effects of chemical neutralization of ammonium paratungstate (APT) by nitric acid, operating pressure, the concentration of AMT and the volume of washing water on the coupling process were systematically discussed. It was found that the better conditions of AMT
The Thermal Decomposition of Ammoniu Metatungstate
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- Category: Tungsten Information
- Published on Monday, 02 February 2015 14:40
The thermal decomposition of ammoniu metatungstate(AMT)involved several steps in inert atmosphere: (i)That is release of crystal water between 25°C and 200°C resulte in dehydrated AMT. (ii) The formation of an amorphous phase between 200°C and 380 °C.