Crystal structure of boron-rich metal borides
Metals, and specifically rare-earth elements (RE), form numerous chemical complexes with boron. Their crystal structure and chemical bonding depend strongly on the metal element M and on its atomic ratio to boron. When B/M ratio exceeds 12, boron atoms form B12 icosahedra which are linked into a three-dimensional boron framework, and the metal atoms reside in the voids of this framework. Those icosahedra are basic structural units of most allotropes of boron and boron-rich rare-earth borides. In such borides, metal atoms donate electrons to the boron polyhedra, and thus these compounds are regarded as electron-deficient solids.
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Crystal structure of boron-rich metal borides
Metals, and specifically rare-earth elements (RE), form numerous chemical complexes with boron. Their crystal structure and chemical bonding depend strongly on the metal element M and on its atomic ratio to boron. When B/M ratio exceeds 12, boron atoms form B12 icosahedra which are linked into a three-dimensional boron framework, and the metal atoms reside in the voids of this framework. Those icosahedra are basic structural units of most allotropes of boron and boron-rich rare-earth borides. In such borides, metal atoms donate electrons to the boron polyhedra, and thus these compounds are regarded as electron-deficient solids.
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Metals, and specifically rare- ...... hous-like", crystal structure.
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Fig. 11. Structure unit of B4 ...... y nitrogen and carbon atoms.
Fig. 12. Stacking sequences of ...... B22C2N and YB28.5C4 compounds.
Fig. 19. Network of boron ico ...... Sc and Si atoms, respectively.
Fig. 21. ScB17C0.25 crystal s ...... l structure is also added to .
Fig. 24. Supertetrahedron T, ...... +ySi0.083–z crystal structure.
Fig. 26. Sc4.5–xB57–y+zC3.5–z ...... ework of Sc4.5–xB57–y+zC3.5–z.
Fig. 30. Pillar-like structur ...... layer of the hexagonal phase.
Fig. 9. The boron network tha ...... ithin the range x = 0.09–0.41.
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Metals, and specifically rare- ...... as electron-deficient solids.
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Crystal structure of boron-rich metal borides
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