2. Phase transformations of carbon and boron nitride at high pressure and deformation under pressure

2013 ◽  
pp. 88-122
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Phase Transformations

scholarly journals Stabilizing the metastable superhard material wurtzite boron nitride by three-dimensional networks of planar defects

2019 ◽  
Vol 116 (23) ◽  
pp. 11181-11186 ◽  
Author(s):  
Chunlin Chen ◽  
Deqiang Yin ◽  
Takeharu Kato ◽  
Takashi Taniguchi ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Phase Transformations ◽  
Superhard Material ◽  
Common Knowledge ◽  
Crystal Defects ◽  
Ab Initio Molecular Dynamics ◽  
Wurtzite Phase ◽  
Planar Defects ◽  
3D Networks

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 {101¯0} 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.

High pressure phase transformations in turbostratic boron nitride using magnesium boron nitride as the catalyst

1994 ◽  
Vol 144 (1-2) ◽  
pp. 97-102 ◽  
Author(s):  
M.M. Bindal ◽  
B.P. Singh ◽  
S.K. Singhal ◽  
R.K. Nayar ◽  
Rajeev Chopra
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Phase Transformations ◽  
High Pressure Phase ◽  
Pressure Phase

Effect of Al on the Formation of Cubic Boron Nitride Using Ni3Al Solvent under High Pressure

2007 ◽  
Vol 46 (11) ◽  
pp. 7388-7391 ◽  
Author(s):  
Yoichi Kubota ◽  
Kosuke Kosuda ◽  
Takashi Taniguchi
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Cubic Boron Nitride

Ultraviolet light emission from self-organized p–n domains in cubic boron nitride bulk single crystals grown under high pressure

2002 ◽  
Vol 81 (22) ◽  
pp. 4145-4147 ◽  
Author(s):  
T. Taniguchi ◽  
K. Watanabe ◽  
S. Koizumi ◽  
I. Sakaguchi ◽  
T. Sekiguchi ◽  
...  
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Single Crystals ◽  
Ultraviolet Light ◽  
Light Emission ◽  
Cubic Boron Nitride ◽  
Self Organized ◽  
Bulk Single Crystals

Phase transformations in Zr under high-pressure and shear deformation treatment

2019 ◽  
Vol 6 (4) ◽  
pp. 046506 ◽  
Author(s):  
A A Yaroslavzev ◽  
I A Evdokimov ◽  
B A Kulnitskiy ◽  
I A Perezhogin ◽  
V D Blank ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformations ◽  
Shear Deformation ◽  
Deformation Treatment
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