Characterization of Beryllium–Boron-Bearing Materials by Parallel Electron Energy-Loss Spectroscopy (PEELS)

✍ Scribed by Laurence A.J. Garvie; Peter R. Buseck; Peter Rez

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 451 KB
• Volume: 133
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7581

✦ Synopsis

The stoichiometry of a set of commercial and laboratorysynthesized Be-B-bearing materials was determined by parallel electron energy-loss spectroscopy (PEELS). The Be and B K edges are well separated in energy, allowing easy determination of the elemental ratios. PEELS analyses of materials with reported compositions of ''Be 2 B'' and ''Be 2 B 3 '' provided stoichiometries near Be 2.8 B and Be 4 B 5 , respectively. We confirmed an earlier report of Be 0.6(؎0.1) B 5.9(؎0.7) C, a material with the -rhombohedral B structure. We also synthesized and characterized Be 0.5(؎0.1) B 4.9(؎0.3) N, a new ternary material with the -rhombohedral B structure with refined hexagonal cell parameters of a h ‫)5(784.5؍‬ A s and c h ‫)41(684.21؍‬ A s . By comparison of the features at the core-loss edges of Be 0.5(؎0.1) B 4.9(؎0.3) N, we conclude that most N forms N 2 pairs between the icosahedra and Be substitutes for B within the icosahedra.