Effects of Variable Boron Concentration on the Properties of Superhard Tungsten Tetraboride
| Autor: | Christopher L. Turner, Georgiy Akopov, Inwhan Roh, Michael T. Yeung, Zachary C. Sobell, Lisa E. Pangilinan, Richard B. Kaner |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Chemical substance
Inorganic chemistry Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Catalysis 0104 chemical sciences Colloid and Surface Chemistry chemistry Transition metal Superhard material Thermal stability 0210 nano-technology Boron Spectroscopy Ambient pressure |
| Zdroj: | Journal of the American Chemical Society. 139(47) |
| ISSN: | 1520-5126 |
| Popis: | Tungsten tetraboride is an inexpensive, superhard material easily prepared at ambient pressure. Unfortunately, there are relatively few compounds in existence that crystallize in the same structure as tungsten tetraboride. Furthermore, the lack of data in the tetraboride phase space limits the discovery of any new superhard compounds that also possess high incompressibility and a three-dimensional boron network that withstands shear. Thus, the focus of the work here is to chemically probe the range of thermodynamically stable tetraboride compounds with respect to both the transition metal and the boron content. Tungsten tetraboride alloys with a variable concentration of boron were prepared by arc-melting and investigated for their mechanical properties and thermal stability. The purity and phase composition were confirmed by energy dispersive X-ray spectroscopy and powder X-ray diffraction. For variable boron WBx, it was found that samples prepared with a metal to boron ratio of 1:11.6 to 1:9 have simila... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|