Tungsten oxide is an important intermediate in the tungsten smelting process. According to different colors, it can be divided into yellow tungsten oxide, blue tungsten oxide, purple tungsten oxide and brown tungsten oxide. They are respectively referred to as “yellow tungsten”, “blue tungsten”, “Purple tungsten” and “brown tungsten”. No matter in physical and chemical properties or in production and application, they all have certain differences, and yellow tungsten and purple tungsten also have obvious differences.
- The concept difference between yellow tungsten oxide and purple tungsten oxide
Yellow tungsten oxide, also known as tungsten trioxide and yellow tungsten, is the most stable tungsten oxide among tungsten oxides. It is composed of 1 tungsten atom and 3 oxygen atoms. The English name is Yellow Tungsten Oxide (YTO) or Tungsten Trioxide , the molecular formula is WO3, the molecular weight is 231.85, and the CAS accession number is 314-35-8.
Violet tungsten oxide, also known as tungsten purple oxide or violet tungsten, is a kind of oxygen-deficient tungsten oxide or oxygen-vacancy tungsten oxide, which consists of 18 tungsten atoms and 49 oxygen atoms. The English name is Violet Tungsten Oxide (VTO or TVO) or Purple Tungsten Oxide, chemical formula W18O49 or WO2.72, molecular weight 227.36.
- The difference in microstructure between yellow tungsten and purple tungsten
Yellow tungsten particles not only have sharp edges and corners, but also have a larger particle size; while purple tungsten particles are composed of needle-shaped or rod-shaped grains, with abundant cracks and smaller particle size.
- Similarities and differences in physical and chemical properties of yellow tungsten and purple tungsten
The same point: Both yellow tungsten and purple tungsten have the basic properties of ordinary tungsten oxide, such as powder, odorless, insoluble in water, alcohol and most acids, and can react with alkaline solutions (such as ammonia and sodium hydroxide, etc.), with Strong oxidation and electromagnetic wave absorption ability, good photoinduced effect, electrochromic and gas sensitivity and other characteristics.
The difference: the color of yellow tungsten is yellow or green, the measured density is 7.21-7.30 g/cm3, and the density measured by X-ray is 7.27 g/cm3; With a density of 7.78 g/cm3, it has certain reducibility and high chemical activity.
- The production process of yellow tungsten and purple tungsten is different
The preparation methods of yellow tungsten and purple tungsten are basically the same, including ammonium paratungstate hydrogen reduction method and direct synthesis method. It is worth mentioning that violet tungsten can also be produced from yellow tungsten and tungsten powder.
- Differences in the use of yellow tungsten and purple tungsten
Both yellow tungsten and purple tungsten can be used to make other tungsten products, such as tungstate, high-density alloy and hard alloy, etc., and can also be used to make electrode materials for energy storage batteries, gas sensors, thermal insulation coatings, catalysts , shielding materials and invisible materials, etc. It should be noted that the quality of the products produced by the two may have certain differences. For example, the actual capacity and lithium ion migration rate of electrode materials produced by purple tungsten may be higher than those produced by yellow tungsten, mainly due to Due to the special crystal structure of purple tungsten oxide, it has a large specific surface area.
More details of violet tungsten oxide product, please visit website: violet-tungsten-oxide.com
Please contact CHINATUNGSTEN for inquiry and order of violet tungsten oxide:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
