Properties of Tungsten

Jansen H J F and Freeman A J 1984 Total-energy full-potential linearized augmented plane-wave method for bulk solids electronic and structural properties of tungsten Phys. Rev. B 30 561-9... 

Li, Y Su, X., Jian, J. and Wang, J. (2010) Ethanol sensing properties of tungsten oxide nanorods prepared by microwave hydrothermal method. Ceramics International, 36, 1917-1920. 

P. A. G. O Hare, G. A. Hope. Thermodynamic Properties of Tungsten Ditelluride (WTe2) II. Standard Molar Enthalpy of Formation at the Temperature of298.15 K. J. Chem. Thermodynamics 1992, 24, 639-647. 

W+40.68 A, W+60.65 A. Metallic radius 1.37045 A. Other important physical properties of tungsten are given under Chemical Elements. 

Synthesis and catalytic properties of tungsten carbide for isomerization, reforming and hydrogenation... 

Weber, M.F., "Electrocatalytic Activity and Surface Properties of Tungsten Bronzes," Ph.D. Thesis, Iowa State University, 1977, p.76. 

The thin yellow flakes of tungsten(VI) dichloride dioxide, and the compounds to be mentioned later as well, are sensitive to atmospheric moisture. Therefore the reaction tubes must be opened in a dry nitrogen atmosphere and stored either under vacuum or in a dry inert gas. The detailed physical and chemical properties of tungsten(VI) dichloride dioxide are described in the literature.1... 

The chemical properties of tungsten are similar to those of molybdenum tungsten is more expensive, however, and its industrial use is therefore limited. Especially when hydrogenation is carried out under severe conditions, such as in hydrocracking, sulfided Ni-W/A Os catalysts have advantages over sulfided Ni-Mo/Al203. 

Ma, Chun-an Zhang, Wen-kui Chen, Dan-hong Zhou, Bang-xing. Preparation and electrocatalytic properties of tungsten carbide electrocatalysts. Transactions of Nonferrous Metals Society of China 2002 12(6) 1015-1019. 

Some of the physical properties of tungsten are given in Table 3 further property data ate available (12-14). For thermodynamic values, References 5,15, and 16 should he consulted. Two values ate given for the melting point. The value of 3660 K was selected as a secondary reference for the 1968 international practical temperature scale. However, since 1961, the four values that have heen reported ranged from 3680 to 3695 and averaged 3688 K. 

J. C. Vartuli, J. G. Santiesteban, P. Traverso, N. Cardona-Martinez, C. Chang, and S. A. Stevenson, Characterization of the Acid Properties of Tungsten/Zirconia Catalysts Using Adsorption Microcalorimetry and n - Pentane Isomerization Activity, J. Catal. 187, 131-138 (1999). 

The chemical and physical properties of tungsten(V) chloride are well-established.8-11 It melts at 248°, boils at 275.6°, and crystallizes in very dark blue-green needles which decompose quickly when exposed to moist air. The very faint blue-green vapor of tungsten(V) chloride is in contrast to the yellowish-red vapor of tungsten (VI) chloride. It is only very slightly soluble in nonpolar organic solvents and reacts with most of the polar solvents. 

The physical properties of tungsten hexafluoride are given in Table 5 [54-57], Tungsten hexafluoride is a colorless gas at room temperature and is ten times as heavy as air. It condenses into a pale yellow liquid at 17.5 C and forms a white solid below 2.3°C [54]. The vapor pressure is given by the following equations [56] ... 

Table 1 Molecular properties of tungsten-containing enzymes ...

The most important property of tungsten carbide in its utilization in cemented carbides is its ability to dissolve partially in compressed powder mixtures of WC and ferrous metals, particularly cobalt, at 1300 to 1500°C. In the case of sintering with a liquid phase, WC partly crystallizes out of the binder phase of the WC-Co-alloy upon cooling. It becomes embedded in the tough but hard (not brittle) binder phase. 

In addition, some physical and chemical properties of tungsten will... 

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