钴锰矿结构的钛白：已知最硬的氧化物
Cotunnite-structured titanium dioxide: the hardest known oxide
摘要：
尽管有很大的技术重要性和许多调查，测量硬度与金刚石或立方氮化硼的材料还没有被确定。结合理论和实验研究，发现了一种新的多晶型钛白，其中钛在cotunnite（PbCl 2）结构中与氧九配位。在60 GPa以上的压力和1000 K以上的温度下合成的钴钨石结构的TiO 2的硬度测量表明，这种材料是迄今发现的最硬的氧化物。此外，它是迄今为止研究的最不可压缩（测量的体积模量为431 GPa）和最硬（显微硬度为38 GPa）的多晶材料之一。
英文摘要：
Despite great technological importance and many investigations, a material with measured hardness comparable to that of diamond or cubic boron nitride has yet to be identified. Combined theoretical and experimental investigations led to the discovery of a new polymorph of titanium dioxide with titanium nine-coordinated to oxygen in the cotunnite (PbCl2) structure. Hardness measurements on the cotunnite-structured TiO2 synthesized at pressures above 60 GPa and temperatures above 1000 K reveal that this material is the hardest oxide yet discovered. Furthermore, it is one of the least compressible (with a measured bulk modulus of 431 GPa) and hardest (with a microhardness of 38 GPa) polycrystalline materials studied thus far.
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