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Development of the ReaxFF Reactive Force Field for Inherent Point Defects in the Si/Silica System (publisher proof PDF)

Evidence and attribution

Editorial proof / edit trace

This PDF contains publisher query markup overlaid on the J. Phys. Chem. A article also summarized under [[2019nayir-j-phys-chem-development-reaxff-2]]. Scientific content is duplicated from that version-of-record page; this slug records papers/Nayir_JPC_C_SiOx_2019_edit_trace.pdf for provenance. A separate SI-focused ingest exists as [[2019nayir-venue-paper]] per NON_PRIMARY_ARTICLE_PAPER_SLUGS.md.

Summary

The peer-reviewed article reoptimizes ReaxFF parameters for Si/O/H with emphasis on oxygen interstitials in crystalline silicon, migration pathways, and oxidation chemistry at amorphous silica–silicon interfaces. The prior SiOH(2010) parameterization spuriously allowed deep oxygen superdiffusion at 300 K; the new “ReaxFFpresent” set reproduces bond-centered hopping of oxygen in silicon with a barrier near 64.8 kcal mol⁻¹ in the abstract’s comparison to DFT and experiment, and restores physically plausible temperature thresholds for significant diffusion. Annealing tests on a-SiO₂/Si stacks recover interfacial oxygen transport behavior closer to literature expectations.

Methods

PDF note. This file is a publisher proof / edit-trace duplicate of the J. Phys. Chem. A article; for stable figures and numbers use [[2019nayir-j-phys-chem-development-reaxff-2]] and the clean VOR PDF, not the overlay markup here.

1 — MD application (ReaxFF). The article reports reactive MD to validate O diffusion in bulk Si, a-SiO₂ behavior, and a-SiO₂/Si stack annealing after the ReaxFF refit. Engine: ReaxFF-style workflows in LAMMPS / ADF contexts as stated in the main text. System / boundary / ensemble / timestep / thermostat / duration: take from the main article and SI (this proof PDF is not the primary protocol source); N/A to list line-by-line on this galley slug. Barostat / pressure in MD: N/A unless the main text used NPT for a stated segment—confirm on the VOR. Electric field, shear, enhanced sampling: N/A in the abstract-level summary on this page.

2 — Force-field training (Si/O/H). The work reoptimizes ReaxFF Si/O/H for O interstitials and interface oxidation, starting from prior Si/silica fits; DFT training sets and CMA-ES (or related) optimization are in the main paper. The abstract contrasts ReaxFFpresent with SiOH(2010) and reports a bond-centered O barrier near ~64.8 kcal/mol vs DFT/literature in their comparison. Reference QM and validation data are specified in the article; this proof page does not replace the typeset Table/SI line numbers.

3 — Static QM / DFT-only block. As used in training and benchmarks in the main paper, not re-derived here. N/A as a standalone DFT Methods list on this slug.

4 — Review. N/A.

MD details (galley honesty). Atom counts, supercell sizes, 3D PBC, NVT/NPT ensemble, timestep fs, equilibration/production ns, thermostat parameters, and barostat/ pressure GPa targets are given in the main VOR PDF—N/A to recopy from this edit-trace file; molecular dynamics in LAMMPS/ADF as in the article.

Findings

O migration in bulk Si proceeds via bond-centered hops in the (110) plane with an asymmetric saddle geometry; significant diffusion initiates above roughly 1400 K in their analysis, with diffusion coefficients tracking experimental trends. Amorphous silica density matches experiment closely. The revised force field removes the unphysical room-temperature superdiffusion artifact of SiOH(2010).

Interface annealing tests demonstrate that the new parametrization preserves realistic oxygen transport between amorphous silica and silicon without spurious low-temperature leakage, which is critical for gate-stack and oxidation simulations used throughout the Si technology path.

Limitations

Proof PDF may contain duplicated lines from editorial tooling; cite figures from the clean article PDF. Parameter transfer to alkali-bearing glasses requires separate tests.

Corpus notes

Link resolution in Obsidian should prefer [[2019nayir-j-phys-chem-development-reaxff-2]] for readers who need stable figure references; keep this slug for editorial-trace provenance only.

If automated PDF text extraction reintroduces duplicated lines into normalized/extracts, strip those artifacts with scripts/strip_paste_artifacts.py before regenerating chunks, per AGENTS.md hygiene guidance.

Relevance to group

Core Si/SiO₂ defect parametrization for oxidation and gate-stack modeling; this slug is non-primary file packaging only.

Citations and evidence anchors