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Q-carbon: a stunning new phase of carbon
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Researchers from North Carolina State University have discovered a new phase of solid carbon, called Q-carbon, which is distinct from the known phases of graphite and diamond.
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http://www.sciencedaily.com/releases/2015/11/151130152005.htm
By pulsing a powerful laser on amorphous carbon they were able to make a new type of crystalline carbon which is harder and shines brighter than diamond. And it is ferromagnetic!
The process can be done at atmospheric pressure and room temperature.
The only thing holding me back from making my own super diamonds on the kitchen table is the laser 
The material emits light quite easily, so it may find application in new high-efficiency LEDs and displays, electronics, you name it!
BTW. Q-carbon is distinctly different from M-carbon which forms when graphite is kept under 200.000 atm. pressure for long durations. That is much like a 'dirty' diamond, as hard but has a chaotical atomic structure.
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