scholarly journals High-Pressure Softening of the Out-of-Plane A2u(Transverse-Optic) Mode of Hexagonal Boron Nitride Induced by Dynamical Buckling

2019 ◽  
Vol 123 (28) ◽  
pp. 17491-17497 ◽  
Author(s):  
A. Segura ◽  
R. Cuscó ◽  
T. Taniguchi ◽  
K. Watanabe ◽  
G. Cassabois ◽  
...  
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Out Of Plane ◽  
Transverse Optic

Polycrystalline boron nitride constructed from hexagonal boron nitride

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 38589-38593 ◽  
Author(s):  
N. Xu ◽  
J. F. Li ◽  
B. L. Huang ◽  
B. L. Wang
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Polycrystalline Structure ◽  
Shed Light

Two classes of structural families of boron nitride allotropes (named as X-BNs and L-BNs) are proposed to shed light on the polycrystalline structure of high pressure h-BN.

scholarly journals Probing the Out-of-Plane Distortion of Single Point Defects in Atomically Thin Hexagonal Boron Nitride at the Picometer Scale

2011 ◽  
Vol 106 (12) ◽  
Author(s):  
Nasim Alem ◽  
Oleg V. Yazyev ◽  
Christian Kisielowski ◽  
P. Denes ◽  
Ulrich Dahmen ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Point Defects ◽  
Hexagonal Boron Nitride ◽  
Single Point ◽  
Out Of Plane

Tribology in Superplastic Forming Processing of 3Y-TZP/Al2O3 Ceramic at Elevated Temperatures

2007 ◽  
Vol 551-552 ◽  
pp. 507-512
Author(s):  
F. Wang ◽  
Kai Feng Zhang ◽  
Wen Bo Han
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Friction Factor ◽  
Elevated Temperatures ◽  
Hexagonal Boron Nitride ◽  
Superplastic Forming ◽  
Ceramic Materials ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Higher Temperature

Superplastic forming processing of ceramic materials at high temperatures and high pressure puts forward very high requests to moulds and lubricants, at which conditions seeking for appropriate lubricants is one of important preconditions in the superplastic forming of ceramic materials. Using ring compressive testing, lubricities of hexagonal boron nitride in superplastic compressive forming processing of 3Y-TZP/Al2O3 ceramic composite at elevated temperatures were investigated. Theoretical curves of friction factor were drawn according to upper bound method. Ring compressive tests were adopted at temperature of 1400 °C-1600 °C. The results indicate that when BN is used, friction factor is about 0.4, meanwhile friction factor don’t have great changes with higher temperature and increasing strain rate. X-ray diffraction shows that under high temperature and high pressure no boron nitride converts to cubic phase, which remains at room temperature.

On the choice of hexagonal boron nitride for high pressure phase transformation using the catalyst solvent process

1991 ◽  
Vol 26 (1) ◽  
pp. 196-202 ◽  
Author(s):  
M. M. Bindal ◽  
B. P. Singh ◽  
S. K. Singhal ◽  
R. K. Nayar ◽  
R. Chopra ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
High Pressure Phase ◽  
Pressure Phase

Title: Periodic Mesoporous Hexagonal Boron Nitride at High Pressure: A Route to Cubic Boron Nitride Nanocrystals and Mesoporous Cubic Boron Nitride

2017 ◽  
Vol 2 (2) ◽  
pp. 740-744 ◽  
Author(s):  
Manik Mandal ◽  
Cong Liu ◽  
Toby Sanders ◽  
Fadi Haso ◽  
Venkata Bhadram ◽  
...  
Keyword(s):  
High Pressure ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Cubic Boron Nitride

scholarly journals Mechanical decoupling of quantum emitters in hexagonal boron nitride from low-energy phonon modes

2020 ◽  
Vol 6 (40) ◽  
pp. eaba6038 ◽  
Author(s):  
Michael Hoese ◽  
Prithvi Reddy ◽  
Andreas Dietrich ◽  
Michael K. Koch ◽  
Konstantin G. Fehler ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Boron Nitride ◽  
Room Temperature ◽  
Hexagonal Boron Nitride ◽  
Photon Emission ◽  
Phonon Modes ◽  
Out Of Plane ◽  
The Fourier Transform ◽  
Mechanical Decoupling ◽  
Quantum Emitters

Quantum emitters in hexagonal boron nitride were recently reported to hold unusual narrow homogeneous linewidths of tens of megahertz within the Fourier transform limit at room temperature. This unique observation was traced back to decoupling from in-plane phonon modes. Here, we investigate the origins for the mechanical decoupling. New sample preparation improved spectral diffusion, which allowed us to reveal a gap in the electron-phonon spectral density for low phonon frequencies. This sign for mechanical decoupling persists up to room temperature and explains the observed narrow lines at 300 kelvin. We investigate the dipole emission directionality and reveal preferred photon emission through channels between the layers supporting the claim for out-of-plane distorted defect centers. Our work provides insights into the underlying physics for the persistence of Fourier transform limit lines up to room temperature and gives a guide to the community on how to identify the exotic emitters.

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