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Title: Ultrahard stitching of nanotwinned diamond and cubic boron nitride in C2-BN composite

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep30518· OSTI ID:1326659
 [1];  [1];  [2];  [2];  [3];  [4];  [4];  [5];  [6];  [1];  [1]
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Earth and Planetary Sciences
  2. Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials
  3. Northwestern Univ., Evanston, IL (United States). Atomic and Nanoscale Characterization Experimental (NUANCE) center
  4. Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
  5. Rice Univ., Houston, TX (United States). Lab. for Nanophotonics, Dept. of Physics & Astronomy
  6. Univ. of Bayreuth, Bayreuth (Germany). Bayerisches Geoinstitut

Materials combining the hardness and strength of diamond with the higher thermal stability of cubic boron nitride (cBN) have broad potential value in science and engineering. Reacting nanodiamond with cBN at moderate pressures and high temperatures provides a pathway to such materials. Here we report the fabrication of Cx-BN nanocomposites, measuring up to 10 mm in longest dimension, by reacting nanodiamond with pre-synthesized cBN in a large-volume press. The nanocomposites consist of randomly-oriented diamond and cBN domains stitched together by sp3-hybridized C-B and C-N bonds, leading to p-type semiconductivity. Dislocations near the sutures accommodate lattice mismatch between diamond and cBN. Nanotwinning within both diamond and cBN domains further contributes to a bulk hardness ~50% higher than sintered cBN. We find the nanocomposite of C2-BN exhibits p-type semiconductivity with low activation energy and high thermal stability, making it a functional,ultrahard substance.

Research Organization:
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); German Research Foundation (DFG)
Grant/Contract Number:
FG02-94ER14466; NA0001974; FG02-99ER45775; DMR-1121262; INST 91/315-1 FUGG; EAR-1128799; AC02-06CH11357; DMR-1411344; DMR-1508577; EAR-1361276
OSTI ID:
1326659
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (5)

Boron–oxygen complex yields n-type surface layer in semiconducting diamond journal April 2019
Formation and characterization of nano- and microstructures of twinned cubic boron nitride journal January 2019
Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries journal January 2020
From 2-D to 0-D Boron Nitride Materials, The Next Challenge journal November 2019
Elastic and mechanical softening in boron-doped diamond journal February 2017

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