Superconducting Open-Framework Allotrope of Silicon at Ambient Pressure - PubMed (original) (raw)
Superconducting Open-Framework Allotrope of Silicon at Ambient Pressure
Ha-Jun Sung et al. Phys Rev Lett. 2018.
Abstract
Diamond Si is a semiconductor with an indirect band gap that is the basis of modern semiconductor technology. Although many metastable forms of Si were observed using diamond anvil cells for compression and chemical precursors for synthesis, no metallic phase at ambient conditions has been reported thus far. Here we report the prediction of pure metallic Si allotropes with open channels at ambient pressure, unlike a cubic diamond structure in covalent bonding networks. The metallic phase termed P6/m-Si_{6} can be obtained by removing Na after pressure release from a novel Na-Si clathrate called P6/m-NaSi_{6}, which is predicted through first-principles study at high pressure. We identify that both P6/m-NaSi_{6} and P6/m-Si_{6} are stable and superconducting with the critical temperatures of about 13 and 12 K at ambient pressure, respectively. The prediction of new Na-Si and Si clathrate structures presents the possibility of exploring new exotic allotropes useful for Si-based devices.
Similar articles
- Silicon Framework-Based Lithium Silicides at High Pressures.
Zhang S, Wang Y, Yang G, Ma Y. Zhang S, et al. ACS Appl Mater Interfaces. 2016 Jul 6;8(26):16761-7. doi: 10.1021/acsami.6b04308. Epub 2016 Jun 24. ACS Appl Mater Interfaces. 2016. PMID: 27302244 - Synthesis of Novel Phases in Si Nanowires Using Diamond Anvil Cells at High Pressures and Temperatures.
Huston LQ, Lugstein A, Shen G, Cullen DA, Haberl B, Williams JS, Bradby JE. Huston LQ, et al. Nano Lett. 2021 Feb 10;21(3):1427-1433. doi: 10.1021/acs.nanolett.0c04354. Epub 2021 Jan 27. Nano Lett. 2021. PMID: 33502867 Free PMC article. - A Review on Metastable Silicon Allotropes.
Fan L, Yang D, Li D. Fan L, et al. Materials (Basel). 2021 Jul 15;14(14):3964. doi: 10.3390/ma14143964. Materials (Basel). 2021. PMID: 34300884 Free PMC article. Review. - The Microscopic Diamond Anvil Cell: Stabilization of Superhard, Superconducting Carbon Allotropes at Ambient Pressure.
Wang X, Proserpio DM, Oses C, Toher C, Curtarolo S, Zurek E. Wang X, et al. Angew Chem Int Ed Engl. 2022 Aug 8;61(32):e202205129. doi: 10.1002/anie.202205129. Epub 2022 Jun 24. Angew Chem Int Ed Engl. 2022. PMID: 35674197 - Slicing Diamond-A Guide to Deriving sp3 -Si Allotropes.
Jantke LA, Stegmaier S, Karttunen AJ, Fässler TF. Jantke LA, et al. Chemistry. 2017 Feb 24;23(12):2734-2747. doi: 10.1002/chem.201603406. Epub 2016 Nov 10. Chemistry. 2017. PMID: 27862392 Review.
LinkOut - more resources
Full Text Sources
Other Literature Sources
Research Materials
Miscellaneous