Novel high-pressure silicon allotrope with quartz topology from first principles
Abstract
A novel silicon allotrope, qtz Si, with quartz topology is proposed and investigated alongside four known allotropes (dia Si-I, lon Si-IV, bsn Si-II, and gsi Si-III) using first-principles density functional theory. qtz Si is found to exhibit the smallest atom-averaged volume (18.06 A3), highest density (2.582 g/cm3), highest bulk modulus (98 GPa), and highest maximum phonon frequency (16 THz) among the five, while showing the lowest shear modulus (37 GPa). All five allotropes are confirmed to satisfy the Born stability criteria and to display positive phonon frequencies throughout the Brillouin zone, i.e., they are mechanically and dynamically stable. Electronic structure calculations show that qtz Si is a semimetal with a vanishing gap, whereas dia Si and lon Si are semiconductors, and bsn and gsi allotropes are weakly metallic. Energy-volume equations of state place gsi and qtz 0.11-0.15 eV/atom above dia, bsn, and lon, consistent with their identification as high-pressure or metastable phases.
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BibTeX
@misc{matar2026novel,
title = {{Novel high-pressure silicon allotrope with quartz topology from first principles}},
author = {Samir F. Matar and Vladimir L. Solozhenko},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.21683},
eprint = {2610.21683},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.21683},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Novel high-pressure silicon allotrope with quartz topology from first principles
AU - Samir F. Matar
AU - Vladimir L. Solozhenko
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2610.21683
UR - https://arxiv.org/abs/2610.21683
AB - A novel silicon allotrope, qtz Si, with quartz topology is proposed and investigated alongside four known allotropes (dia Si-I, lon Si-IV, bsn Si-II, and gsi Si-III) using first-principles density functional theory. qtz Si is found to exhibit the smallest atom-averaged volume (18.06 A3), highest density (2.582 g/cm3), highest bulk modulus (98 GPa), and highest maximum phonon frequency (16 THz) among the five, while showing the lowest shear modulus (37 GPa). All five allotropes are confirmed to satisfy the Born stability criteria and to display positive phonon frequencies throughout the Brillouin zone, i.e., they are mechanically and dynamically stable. Electronic structure calculations show that qtz Si is a semimetal with a vanishing gap, whereas dia Si and lon Si are semiconductors, and bsn and gsi allotropes are weakly metallic. Energy-volume equations of state place gsi and qtz 0.11-0.15 eV/atom above dia, bsn, and lon, consistent with their identification as high-pressure or metastable phases.
ER -