Synthesis of quenchable amorphous diamond

Zhidan Zeng, Liuxiang Yang, Qiaoshi Zeng (), Hongbo Lou, Hongwei Sheng, Jianguo Wen (), Dean J. Miller, Yue Meng, Wenge Yang, Wendy L. Mao and Ho-kwang Mao ()
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Zhidan Zeng: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Liuxiang Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Qiaoshi Zeng: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Hongbo Lou: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Hongwei Sheng: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Jianguo Wen: Argonne National Laboratory
Dean J. Miller: Argonne National Laboratory
Yue Meng: Carnegie Institution of Washington
Wenge Yang: Center for High Pressure Science and Technology Advanced Research (HPSTAR)
Wendy L. Mao: Stanford University
Ho-kwang Mao: Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Diamond owes its unique mechanical, thermal, optical, electrical, chemical, and biocompatible materials properties to its complete sp 3-carbon network bonding. Crystallinity is another major controlling factor for materials properties. Although other Group-14 elements silicon and germanium have complementary crystalline and amorphous forms consisting of purely sp 3 bonds, purely sp 3-bonded tetrahedral amorphous carbon has not yet been obtained. In this letter, we combine high pressure and in situ laser heating techniques to convert glassy carbon into “quenchable amorphous diamond”, and recover it to ambient conditions. Our X-ray diffraction, high-resolution transmission electron microscopy and electron energy-loss spectroscopy experiments on the recovered sample and computer simulations confirm its tetrahedral amorphous structure and complete sp 3 bonding. This transparent quenchable amorphous diamond has, to our knowledge, the highest density among amorphous carbon materials, and shows incompressibility comparable to crystalline diamond.

Date: 2017
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DOI: 10.1038/s41467-017-00395-w

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