Knowledge Management System Of Institute of metal research，CAS
| Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects | |
| Chen, Chunlin; Yin, Deqiang; Kato, Takeharu; Taniguchi, Takashi; Watanabe, Kenji; Ma, Xiuliang; Ye, Hengqiang; Ikuhara, Yuichi | |
| 2019-06-04 | |
| Source Publication | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
 |
| ISSN | 0027-8424 |
| Volume | 116Issue:23Pages:11181-11186 |
| Abstract | Wurtzite boron nitride (w-BN) is a metastable superhard material that is a high-pressure polymorph of BN. Clarifying how the metastable high-pressure material can be stabilized at atmospheric pressure is a challenging issue of fundamental scientific importance and promising technological value. Here, we fabricate millimeter-size w-BN bulk crystals via the hexagonal-to-wurtzite phase transformation at high pressure and high temperature. By combining transmission electron microscopy and ab initio molecular dynamics simulations, we reveal a stabilization mechanism for w-BN, i.e., the metastable high-pressure phase can be stabilized by 3D networks of planar defects which are constructed by a high density of intersecting (0001) stacking faults and {10 (1) over bar0} inversion domain boundaries. The 3D networks of planar defects segment the w-BN bulk crystal into numerous nanometer-size prismatic domains with the reverse crystallographic polarities. Our findings unambiguously demonstrate the retarding effect of crystal defects on the phase transformations of metastable materials, which is in contrast to the common knowledge that the crystal defects in materials will facilitate the occurrence of phase transformations. |
| Keyword | metastable phase superhard material planar defect electron microscopy |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000470136000022 |
| Publisher | NATL ACAD SCIENCES |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/81018 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Chen, Chunlin,Yin, Deqiang,Kato, Takeharu,et al. Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(23):11181-11186. |
| APA | Chen, Chunlin.,Yin, Deqiang.,Kato, Takeharu.,Taniguchi, Takashi.,Watanabe, Kenji.,...&Ikuhara, Yuichi.(2019).Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(23),11181-11186. |
| MLA | Chen, Chunlin,et al."Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.23(2019):11181-11186. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment