Ionic high-pressure form of elemental boron

@article{Oganov2009IonicHF,
  title={Ionic high-pressure form of elemental boron},
  author={Artem R. Oganov and Jiuhua Chen and Carlo Gatti and Yanzhang Ma and Yanming Ma and Colin W. Glass and Zhenxian Liu and Tony Yu and Oleksandr O. Kurakevych and Vladimir L. Solozhenko},
  journal={Nature},
  year={2009},
  volume={457},
  pages={863-867}
}
Boron is an element of fascinating chemical complexity. Controversies have shrouded this element since its discovery was announced in 1808: the new ‘element’ turned out to be a compound containing less than 60–70% of boron, and it was not until 1909 that 99% pure boron was obtained. And although we now know of at least 16 polymorphs, the stable phase of boron is not yet experimentally established even at ambient conditions. Boron’s complexities arise from frustration: situated between metals… 

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