Synthesis of a New Ternary Nitride, Fe4W2N, with a Uniqueη-Carbide Structure
| Autor: | K.S. Weil, Prashant N. Kumta |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Chemistry
Rietveld refinement Crystal structure Nitride Condensed Matter Physics Electronic Optical and Magnetic Materials Carbide Inorganic Chemistry Crystallography Lattice constant Octahedron Materials Chemistry Ceramics and Composites Diamond cubic Physical and Theoretical Chemistry Powder diffraction |
| Zdroj: | Journal of Solid State Chemistry. 134:302-311 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.1997.7560 |
| Popis: | The structure of a new ternary nitride, Fe 4 W 2 N, prepared using a metal-organic precursor synthesis route, has been determined by Rietveld refinement of the monochromatic X-ray powder diffraction data. The compound crystallizes in a cubic, η -carbide structure, space group Fd 3 m (227), with Z =16 and a lattice parameter of a =11.0810(9) A. The refinement converged with R wp =0.1273, R p =0.0709, R I =0.0478, and S =1.72. The compound is isostructural with Fe 4 W 2 C, the ideal structure consisting of eight octahedra of metal atoms, a random mixture of which one-third are iron and two-thirds are tungsten, centered on a diamond cubic lattice and eight regular tetrahedra of iron atoms centered on a second diamond cubic lattice that interpenetrates the first through a 1 2 , 1 2 , 1 2 unit cell translation. Sixteen additional iron atoms are tetrahedrally coordinated around the iron tetrahedra and sixteen nitrogen atoms surround the metal octahedra in tetrahedral coordination. |
| Databáze: | OpenAIRE |
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