The stoichiometry of a set of commercial and laboratory-synthesized 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 "Be2B" and "Be2B3" provided stoichiometries near Be2.8B and Be4B5, respectively. We confirmed an earlier report of Be0.6(±0.1)B5.9(±0.7)C, a material with theα-rhombohedral B structure. We also synthesized and characterized Be0.5(±0.1)B4.9(±0.3)N, a new ternary material with theα-rhombohedral B structure with refined hexagonal cell parameters ofah=5.487(5) Å andch=12.486(14) Å. By comparison of the features at the core-loss edges of Be0.5(±0.1)B4.9(±0.3)N, we conclude that most N forms N2pairs between the icosahedra and Be substitutes for B within the icosahedra.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry