The search for new ultraincompressible, superhard materials has been performed largely through trial and error. Despite the difficulties in synthesizing such materials, interest in this field has blossomed with recent experimental and theoretical results. Such progress has led to the development of superhard metal borides, ultraincompressible nitrides, and strong carbides. Our previous parameters of high electron density and high covalent bond density had served us well in synthesizing ultraincompressible, superhard metals, but after a decade of research, a more detailed understanding is needed. By studying the origin of strength from previously discovered incompressible, hard materials, we hope to gain new insight into this rapidly growing field. In particular, we propose a focus on bonding and structure to understand why some materials are ultraincompressible and superhard.

中文翻译：

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不可压缩的超硬材料

寻找新的超不可压缩、超硬材料主要是通过反复试验进行的。尽管合成此类材料存在困难，但随着最近的实验和理论结果，对该领域的兴趣日益浓厚。这些进展导致了超硬金属硼化物、超不可压缩氮化物和强碳化物的发展。我们之前的高电子密度和高共价键密度参数在合成超不可压缩、超硬金属方面非常有用，但经过十年的研究，需要更详细的了解。通过研究先前发现的不可压缩的硬质材料的强度起源，我们希望对这个快速发展的领域有新的认识。特别是，