Stories tagged hardness

Feb
13
2009

No one could ever bust this grill: Try as you might.
No one could ever bust this grill: Try as you might.Courtesy Bradley G.
Here’s a little bit more diamond news for y’all. Scientists have discovered not one, but two substances harder than diamonds.

The first material is called “wurtzite boron nitride,” and the other, even harder substance (58% harder than diamonds) is called “lonsdaleite.” Lonsdaleite, as it happens, is made of… diamond.

Or, if you want to be a nerd about it, lonsdaleite is made of carbon, like diamonds are, but it has a slightly different molecular structure. It’s often called “hexagonal diamond.”

Nobody had realized that these materials could be harder than diamonds before, because no one had considered subjecting them to “normal compressive pressures under indenters.” When you do expose wurtzite boron nitride or lonsdaleite to normal compressive pressures under indenters, they go through a phase transformation—that is, something changes in the bonds between their atoms, making them stronger. The atomic bonds in regular diamonds can’t undergo this change.

What’s that? You don’t know what “normal compressive pressures under indenters” is? Seriously? Whatever. Everybody who’s anybody knows what that is. But… um, I don’t know exactly what it means either. I’m pretty sure that it means that the materials undergo this bond-strengthening transformation only when it’s squeezed really hard.

So there you go. Throw out your diamonds, and get yourself some… better diamonds.