Lee, Jae-Kap
Kim, Jin-Gyu
Yu, Seunggun
Lee, Sang-Gil
Kim, Yesong
Moon, Dong Ju
2024-01-19T13:32:12Z
2024-01-19T13:32:12Z
2022-01-10
2021-11
2052-2525
https://pubs.kist.re.kr/handle/201004/116225
AA(h) boron nitride (BN) crystal, assigned to an orthorhombic space group (No. 31, Pm2(1)), is reported here. This new AA(h) BN crystal exhibits a 'linear' morphology for high-resolution transmission electron microscopy (HRTEM) and a (non-hexagonal) 'diagonal' electron-diffraction pattern, which have been experimentally demonstrated in this article. It is also demonstrated that this new crystal is the basic structure of multi-walled BN nanotubes (BNNTs) existing in the form of a helix. The helical AA(h) BNNTs exist in a metastable phase owing to < 200 > texture growth of the orthorhombic crystal, where the energy is similar to 15 meV higher than that of stable AB or AA' BN. It is shown that the typical scanning electron microscope 'fluffy cotton-like' morphology of BNNTs is due to secondary growth of diverse BN sheets (including mono-layers) on incoherently scrolled wall strands of BNNTs, providing further evidence for the helical structure with HRTEM evidence for a left-handed helix.
English
INT UNION CRYSTALLOGRAPHY
WALL CARBON NANOTUBES
GROWTH
CHIRALITY
TUBES
AA(h) BN crystal, basic structure of boron nitride nanotubes
Article
10.1107/S2052252521009118
1
IUCRJ, v.8, pp.1018 - 1023
IUCRJ
8
1018
1023
scie
scopus
000715292400018
2-s2.0-85118932075
Chemistry, Multidisciplinary
Crystallography
Materials Science, Multidisciplinary
Chemistry
Crystallography
Materials Science
Article
WALL CARBON NANOTUBES
GROWTH
CHIRALITY
TUBES
AA(h) BN crystals
boron nitride nanotubes
morphology
transmission electron microscopy
electron diffraction
helical structures