Ultrahard stitching of nanotwinned diamond and cubic boron nitride in C2-BN composite
- Northwestern Univ., Evanston, IL (United States). Dept. of Earth and Planetary Sciences
- Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials
- Northwestern Univ., Evanston, IL (United States). Atomic and Nanoscale Characterization Experimental (NUANCE) center
- Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
- Rice Univ., Houston, TX (United States). Lab. for Nanophotonics, Dept. of Physics & Astronomy
- 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
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