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Title: Ultrahard stitching of nanotwinned diamond and cubic boron nitride in C 2-BN composite

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 C x-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 sp 3-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 C 2-BN exhibits p-type semiconductivity with low activation energy and high thermal stability, making it a functional,ultrahard substance.
 [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
Publication Date:
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
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); German Research Foundation (DFG)
Country of Publication:
United States
OSTI Identifier: