Pyrochlore-type tungsten oxide structure

Pyrochlore type tungsten oxide (often referred to as H2W2O7 or WO3 • 0.5H2O) A vacancy is a layered perovskite-based oxide, due to the molecular sieve having a mesh structure and dielectric stability, and in catalysis, sensing, electrical photochromic, fuel cells and other areas showed a wide range of applications. Further, the tungsten oxide powder pyrochlore type after concentrated hydrochloric acid Na element can be efficiently removed, and after firing can be directly obtained WO3, tungsten industry is expected to be novel intermediates.

Pyrochlore type WO6 tungsten oxide is distorted octahedral structural motifs, by the angle of the top of the tungsten oxide rigid skeleton to build a layered structure with a six-membered ring channels, it has a three-dimensional channel, this channel is conducive to the rapid migration of cations and exchange. Wherein a water molecule is formed directly in contact with the two-dimensional layer structure of tungsten by hydrogen bonding interactions between the layers. Standard stoichiometric H2W2O7 cubic crystal lattice parameters a = 10.305 (3), Z = 16. On the thermal stability is concerned, at temperatures above 320 ℃, tungsten oxide pyrochlore-type structure is destroyed, i.e. WO6 octahedron structural motifs, by angular tungsten oxide build from the top of a rigid skeleton having a six-membered ring pore network structure collapsed, forming a quadrature type of tungsten oxide.

Tungsten Powder Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-powder.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

• < Prev
• Next >