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- Title
Metastable square Bismuth allotrope oriented by six-fold symmetric mica.
- Authors
Wu, Nan; Hu, Xiangchen; Tang, Yinliang; Wu, Congcong; Chen, Yu; Ren, Yiyuan; Zhang, Zhuo; Yu, Yi; Wang, Hung-Ta
- Abstract
Layered bismuth (Bi) has been focused on two Peierls distortion derivatives, i.e., bulk stable β-phase (A7 phase), black phosphorus-like α-phase (A17 phase), and their mutated structures. Metastable structures beyond Peierls distortion system are yet rarely accessible. Here, Bi in square symmetry ( C 4 v ), called s-Bi, was grown via physical vapor deposition. The co-existence of three 120°-associated s-Bi crystal grains was analyzed using transmission electron microscopy. 120°-oriented one-dimensional (1D) nuclei indicate s-Bi heteroepitaxy on six-fold symmetric ( C 6 v ) mica (001). A subsequent nanorod-like nuclei coalescing could promote a morphology evolution, resulting in triangular or hexagonal nanosheets with the unique triple s-Bi structure suitable for later β-Bi growth. Lattice misfit and strain calculations suggest a supercell match between 4 × 7 s-Bi and 3 × 3 mica (001). This work demonstrates the metastable s-Bi structure via anisotropic heteroepitaxy of C 4 v s-Bi on C 6 v mica.
- Publication
NPJ 2D Materials & Applications, 2024, Vol 8, Issue 1, p1
- ISSN
2397-7132
- Publication type
Article
- DOI
10.1038/s41699-024-00495-4