China extremely hard to break through the hardness of the material twice re-synthesis of diamond

TIAN Yong-jun, Yanshan University Professor and professor of Jilin University Ma Yanming team and professor at the University of Chicago Wang Yanbin cooperation, following the 2013 synthesis of nano-twinned CBN extremely hard to make a breakthrough once again, at high temperature hardness successfully synthesized twice the natural Nano-twinned diamond diamond bulk. June 12, findings in "Nature" published.

Natural diamond has been the hardest material in nature acknowledged. After 1955, the U.S. General Electric Company using high-temperature high-pressure techniques in the laboratory synthetic diamond single crystals synthesized harder than natural diamond has become the common dream of new material scientific community and industry. 2013, TIAN Yong-jun families Firstly onion structure under high pressure boron nitride precursor was successfully synthesized nano twinned cubic boron nitride, the hardness exceeds the artificial diamond.

So far, through the high-pressure graphite, amorphous carbon, glassy carbon and carbon-60, such as carbon precursor phase transition can not be obtained nano-twinned diamond. To this end, TIAN Yong-jun team and its collaborators began to study the phase transition in carbon onions under high temperature and pressure. At a lower temperature while forming nano-carbon onion twinned diamond cubic structure also give birth to a monoclinic structure of diamond; nano twinned diamond at higher temperatures, carbon onions transformed into a single phase, twinning The average thickness as small as 5 nm. This nano-twinned diamond has never had a hardness and stability: natural diamond Vickers hardness of about twice the initial oxidation in air temperature higher than 200 degrees Celsius natural diamond.


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