Scientists in Japan Build Harder Diamond Using New Method

The new material could be used in industrial applications that need synthetic cutting diamonds.
Fabienne Lang

Scientists of the University of Tsukuba in Japan have devised a method for rearranging carbon atoms in a diamond that makes it even harder than before. 

This new method would create harder diamonds that could potentially be useful in industrial applications where synthetic diamonds are used for cutting. 

The study on these "pentadiamonds" — as they're dubbed by their creators — was published in Physical Review Letters.


Computer calculations and diamonds

The researchers used computer calculations to turn diamonds into harder materials than they naturally are — quite the feat given diamonds are already the strongest naturally occurring materials on Earth. 

Diamonds aren't the only configurations made up of carbon atoms, which are called allotropes. There's lead, whcih we use in our day to day pencils, as well as carbon nanotubes. The way an allotrope becomes hard depends largely on the way its atoms bond together.

In regular diamonds, each carbon atom forms a bond with four neighbors.

Scientists in Japan Build Harder Diamond Using New Method
Fused pentagons that are used to create a pentadiamond, Source: University of Tsukuba

What the University of Tsukuba researchers did was to see what would happen if carbon atoms were formed in a more complex structure. 

So, the team used a computational method called density functional theory (DFT) to calculate the most stable atomic configuration. Through this method, the researchers discovered that the Young's modulus, a measure of hardness, of pentadiamond was predicted to be nearly 1,700 GPa, compared with a regular diamond with 1,200 GPa.

"Not only is pentadiamond harder than conventional diamond, its density is much lower, equal to that of graphite," explained co-author Professor Mina Maruyama.

"This work shows the power of designing materials ab initio. In addition to industrial cutting and drilling uses, pentadiamonds might be used in place of diamond anvil cells currently used in scientific research to recreate the extreme pressure inside planets" said senior co-author Professor Susumu Okada.

Scientists in Japan Build Harder Diamond Using New Method
The geometric structure of pentadiamond, Source: University of Tsukuba
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