2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 8: Composite & Ceramic, Quasi-crystals and Nanomaterials
| Editors: | Kongoli F, Pech-Canul M, Kalemtas A, Werheit H |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-31-7 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The Role of Non-Stoichiometry of Boron and Boron-Rich Solids
Koun Shirai1;1, Ibaraki, Japan;
Type of Paper: Regular
Id Paper: 286
Topic: 18
Abstract:
A fundamental theoretical problem for boron solids is that many structures are predicted to be metals, while experimentally all are insulators. This fundamental problem has been recently solved by the present authors. The problem is intimately related to a distinct property of the boron crystals, namely breaking of stoichiometry. By using this view, the authors have solved a longstanding problem of defects in boron carbide. The second material for testing our view is Ią-tetragonal boron, which has also a historical problem as to whether pure structure exists or not. Recent experiments of high-pressure synthesis suggest the existence of pure structure. Our calculations attempt to describe under which conditions the pure structure becomes stable.