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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 PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
Volume116Issue:23Pages:11181-11186
AbstractWurtzite 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.
Keywordmetastable phase superhard material planar defect electron microscopy
Indexed BySCI
Language英语
WOS IDWOS:000470136000022
PublisherNATL ACAD SCIENCES
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://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.
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