Cold -compressed graphite requires only pressure synthesize, says study

Cold -compressed graphite requires only pressure to synthesize, says study

11:43 AM, 26th July 2012
Cold -compressed graphite requires only pressure to synthesize, says study
Shadows show severe damage from M-carbon.

CONNECTICUT, US: A Yale-led team of mineral physicists has for the first time confirmed through high-pressure experiments the structure of cold-compressed graphite, a form of carbon that is comparable in hardness to its cousin, diamond, but only requires pressure to synthesize. The researchers believe their findings could open the way for a super hard material that can withstand great force and can be used, as diamond-based materials are now, for many electronic and industrial applications.

Under normal conditions, pure carbon exhibits vastly different physical properties depending on its structure. For example, graphite is soft, but diamond is one of the hardest materials known. Graphite conducts electricity, but diamond is an insulator. In the middle is the form of carbon confirmed by the Yale-led team, dubbed M-carbon and predicted by theoretical methods initially in 2006. M-carbon is made when graphite is compressed to pressures approximately 200,000 times room pressure, at room temperature.

Although changes were first observed in graphite under high pressure and room temperature conditions 50 years ago, it is only now that the crystal structure has been confirmed by experiment, using long duration X-ray diffraction, Raman spectroscopy and optical techniques to verify these predictions. “Besides the unique mechanical properties discovered in M-carbon, we find that the transformation of graphite to M-carbon is extremely sluggish and requires a long time to reach equilibrium, which may be the additional reason why this puzzle remained unsolved for the past half century,” said Yuejian Wang, First author the study and former Postdoctoral Researcher, Yale.

According to researchers, this intermediate structure has much lower symmetry than diamond, but is as hard. “Our study shows that M-carbon is extremely incompressible and hard, rivaling the extreme properties of diamond so much that it damages diamond. Over the past few years, many theoretical computations have suggested at least a dozen different crystal structures for this new phase, but our experiments showed that only one crystal structure fits the data - M-carbon,” said Kanani KM Lee, Principal Investigator, Assistant Professor, Yale.

© Yale University News

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