New synthetic ultra-hard diamond glass

Researchers use a multi-anvil press to convert fullerene C60 to diamond glass, similar to the process of converting graphite to diamond with a high pressure device. Credit: Yingwei Fei

Carnegie’s Yingwei Fei and Lin Wang were part of an international research team synthesizing new ultra-hard foam carbon glass with a wealth of practical applications for devices and electronics. It is the hardest known glass with the highest thermal conductivity of all glass materials.Their findings are published in Nature..

When it comes to understanding the properties of materials, function follows shape. The way the atoms chemically bond to each other and the resulting structural arrangement determine the physical quality of the material. Both those that can be observed with the naked eye and those that can only be revealed by scientific research.

Carbon, alone or in combination with other elements, is unmatched in its ability to form stable structures.Some formats of carbon The crystal lattice is repeated and highly organized. Others are more chaotic and the quality is called amorphous.

The type of bond that holds the carbon-based material together determines its hardness. For example, soft graphite has a two-dimensional bond and hard diamond has a three-dimensional bond.

“Synthesis of amorphous carbon materials with three-dimensional bonds has long been a goal,” explained Faye. “The secret is to find the right starting material that deforms when pressure is applied.”

“For decades, Carnegie researchers have been at the forefront of this field, using laboratory techniques to generate extreme pressure, create new materials, and conditions found deep inside the planet. I’m imitating it, “added Richard Carlson, director of the Institute for Planetary Materials, Carnegie.

That very High melting pointIt is not possible to use diamond as a starting point for synthesizing glass like diamond. However, a research team led by Jilin University’s Bing Bin Liu and former Carnegie visiting scholar Ming An Yao is groundbreaking using a 60-molecule carbon form arranged to form a hollow ball. Has achieved great results. Informally called Buckyball, this Nobel Prize-winning material turns carbon into crystalline diamond under pressure after being heated enough to disrupt a soccer ball-like structure and induce disorder. I did.

The team used a large number of multi-anvil presses to synthesize diamond-like glass. Glass is large enough for characterization. Its properties have been confirmed using various advanced high resolution techniques for scrutinizing the atomic structure.

“Creating glass with such excellent properties will open the door to new applications,” Faye explained. “The use of new glass materials depends on making large pieces that have raised challenges in the past. Lower temperature Where we were able to synthesize this new carbide diamond Glass Make mass production more practical. ”

The newly synthesized AM-III carbon is the hardest and strongest amorphous material ever.

For more information:
Bingbing Liu, Carbide Bulk Amorphous Carbon from Collapsed Fullerenes, Nature (2021). DOI: 10.1038 / s41586-021-03882-9

Quote: Synthesized new ultra-hard diamond glass (November 24, 2021) was obtained from https: // on November 24, 2021. I did.

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New synthetic ultra-hard diamond glass

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