RMIT researcher Professor Dougal McCulloch has helped develop a diamond that’s predicted to be harder than a jeweller’s diamond.
It will be useful for cutting through ultra-solid materials on mining sites.
The international project was led by the Australian National University and included experts from RMIT, the University of Sydney and the United States.
Associate Professor Jodie Bradby from ANU said the team had created nano-sized Lonsdaleite, which is a hexagonal diamond found in nature only at the site of meteorite impacts such as Canyon Diablo in the US.
“This new diamond is not going to be on any engagement rings. You’ll more likely find it on a mining site – but I still think that diamonds are a scientist’s best friend,” Bradby said.
“Any time you need a super-hard material to cut something, this new diamond has the potential to do it more easily and more quickly.”
The research team made the Lonsdaleite in a diamond anvil at 400 degrees Celsius, halving the temperature at which it can be formed in a laboratory.
Bradby said: “The hexagonal structure of this diamond’s atoms makes it much harder than regular diamonds, which have a cubic structure.
“We’ve been able to make it at the nanoscale and this is exciting because often with these materials ‘smaller is stronger’.”
Lonsdaleite is named after the British pioneering female crystallographer Dame Kathleen Lonsdale, the first woman elected as a Fellow to the Royal Society.
The research is published in Scientific Reports.
McCulloch said the collaboration of world-leading experts in the field was essential to the project’s success.
“The discovery of the nano-crystalline hexagonal diamond was only made possible by close collaborative ties between leading physicists from Australia and overseas, and the team used state-of-the-art instrumentation such as electron microscopes.”
Corresponding author from the University of Sydney, Professor David McKenzie, said he was doing the night shift in the United States laboratory as part of the research when he noticed a little shoulder on the side of a peak.
“And it didn’t mean all that much until we examined it later on in Melbourne and in Canberra – and we realised that it was something very, very different.”
Professor Dougal McCulloch
Director, RMIT Microscopy and Microanalysis Facility
T: +61 3 9925 3391
Associate Professor Jodie Bradby
ANU Research School of Physics and Engineering
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M: +61 40 227 6767
Professor David McKenzie
The Applied and Plasma Physics research group, University of Sydney
T: +61 2 9351 5986
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