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Crystal structure of dense pseudo-cubic boron allotrope, pc-B₅₂, by powder X-ray diffraction
During past years, a number of reports have been published on synthesis of tetragonal allotrope of boron, t-B₅₂ phase. However, no unambiguous characterization of the crystal structure has been performed to the present time, while remarkable variation of the a/c lattice-parameter ratio raises strong...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут надтвердих матеріалів ім. В.М. Бакуля НАН України
2013
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| Series: | Сверхтвердые материалы |
| Subjects: | |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/126028 |
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| Summary: | During past years, a number of reports have been published on synthesis of tetragonal allotrope of boron, t-B₅₂ phase. However, no unambiguous characterization of the crystal structure has been performed to the present time, while remarkable variation of the a/c lattice-parameter ratio raises strong doubts about its uniqueness. Here the Rietveld refinement of the crystal structure of the high pressure-high temperature boron phase synthesized by a direct solid-state transformation of rhombohedral β-B₁₀₆ at 20 GPa and 2500 K has been reported for the first time. Although this boron allotrope belongs to the t-B₅₂ type, its structure can be considered as pseudo-cubic with the a/c ratio of √2. |
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