Properties in Reactive Structure Materials: ZrW(2)and HfW2- High Melting Temperatures, Densities, Hardness, and Exothermic Ignition Energies

Evers, Jürgen; Huber, Stefan; Oehlinger, Gilbert und Klapötke, Thomas M. (2020): Properties in Reactive Structure Materials: ZrW(2)and HfW2- High Melting Temperatures, Densities, Hardness, and Exothermic Ignition Energies. In: Zeitschrift für Anorganische und Allgemeine Chemie, Bd. 646, Nr. 22: S. 1805-1811

Abstract

ZrW(2)and HfW(2)were prepared by melting the constituent elements in an arc-furnace. By cooling through perictectic phase lines above approximately 2000 degrees C, samples of the nominal 1:2 composition were obtained as products consisting of two phases, of which approximately 95 % adopts the MgCu(2)type structure and 5 % the W structure. In ZrW(2)and in HfW2, the MgCu(2)type structure enables efficient topological compact spacefilling of the smaller W atoms into the cavities of the three-dimensional net constructed by the larger tetravalent metals Zr and Hf. Correspondingly, very dense and hard alloys are obtained which burn at a crash in air in a strong exothermic ignition reaction. These materials are non-toxic.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0044-2313
• Sprache: Englisch