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DOE OSTI2020

Materials Data on Al(MoS2)12 by Materials Project

Al(MoS2)12 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are nine inequivalent Mo+3.75+ sites. In the first Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form edge-sharing MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.37–2.55 Å. In the second Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share a cornercorner with one AlS4 tetrahedra and edges with six MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.35–2.60 Å. In the third Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with two equivalent AlS4 tetrahedra and edges with six MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.34–2.60 Å. In the fourth Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted edge-sharing MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.36–2.55 Å. In the fifth Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with three equivalent AlS4 tetrahedra and edges with six MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.34–2.60 Å. In the sixth Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted edge-sharing MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.37–2.55 Å. In the seventh Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted edge-sharing MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.37–2.55 Å. In the eighth Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share a cornercorner with one AlS4 tetrahedra and edges with six MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.37–2.62 Å. In the ninth Mo+3.75+ site, Mo+3.75+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with two equivalent AlS4 tetrahedra and edges with six MoS6 octahedra. There are a spread of Mo–S bond distances ranging from 2.35–2.61 Å. Al3+ is bonded to four S2- atoms to form AlS4 tetrahedra that share corners with twelve MoS6 octahedra. The corner-sharing octahedra tilt angles range from 62–66°. All Al–S bond lengths are 2.26 Å. There are eighteen inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the second S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the third S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the fourth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the fifth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the sixth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the seventh S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the eighth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the ninth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+3.75+ atoms. In the tenth S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to three Mo+3.75+ atoms. In the eleventh S2- site, S2- is bonded in a trigonal non-coplanar geometry to three Mo+3.75+ atoms. In the twelfth S2- site, S2- is bonded to three Mo+3.75+ and one Al3+ atom to form a mixture of distorted edge and corner-sharing SAlMo3 tetrahedra. In the thirteenth S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to three Mo+3.75+ atoms. In the fourteenth S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to three Mo+3.75+ atoms. In the fifteenth S2- site, S2- is bonded to three Mo+3.75+ and one Al3+ atom to form a mixture of distorted edge and corner-sharing SAlMo3 tetrahedra. In the sixteenth S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to three Mo+3.75+ atoms. In the seventeenth S2- site, S2- is bonded in a 4-coordinate geometry to three Mo+3.75+ and one Al3+ atom. In the eighteenth S2- site, S2- is bonded in a trigonal non-coplanar geometry to three Mo+3.75+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2026

matsim-agents v1.0

matsim-agents is a multi-agent AI framework for atomistic materials simulation and discovery. It orchestrates large language models (LLMs), machine-learned interatomic potentials (MLIPs), and DFT codes into a single agentic loop running on laptops and DOE leadership-class supercomputers. MULTI-AGENT ORCHESTRATION A LangGraph state machine with three nodes: a Planner that converts a natural-language research objective into structured tasks; an Executor that dispatches atomistic tools and loops until the queue is empty; and an Analyst that summarizes results into a human-readable report. State is checkpointed after every step and human-in-the-loop gates can be inserted at any edge. HYPOTHESIS-DRIVEN DISCOVERY CHAT An interactive REPL (matsim-agents chat) that couples LLM dialogue with atomistic simulation. Chemical formulas are automatically detected in conversation turns and trigger a full crystal-phase exploration: structure generation → relaxation → stability scoring → result injection back into the conversation, creating a closed hypothesis-refinement loop. CRYSTAL PHASE ENUMERATION Given a composition, the phase explorer enumerates prototypes by stoichiometry: elemental (fcc/bcc/hcp/sc/diamond), binary 1:1 (rocksalt/CsCl/zincblende/ wurtzite/fluorite/rutile), ternary 1:1:3 (cubic perovskite), ternary 1:2:4 (perovskite + spinel), quaternary 1:1:2:6 (Fm-3m double perovskite). 2-D prototypes (graphene, h-BN, MoS2 2H/1T) and multilayer stacking are also supported via --include-2d and --num-layers. SUPERCELL GENERATION AND SITE DECORATION Auto-tiling to a minimum atom count (--min-atoms), explicit NxNxN tiling (--supercell), symmetry-distinct site decorations (--n-orderings), and isotropic lattice-scale sweeps (--lattice-scales) for volume bracketing. MLFF RELAXATION AND STABILITY SCORING HydraGNN (multi-headed GNN) drives structure relaxation via ASE with FIRE, BFGS, or BFGSLineSearch. Stability output: delta-E/atom ranking across phases and a max-residual-force dynamical-stability proxy. Other MLIPs (MACE, NequIP, Orb) can be plugged in through the same interface. DFT BACKENDS Quantum ESPRESSO pw.x and VASP 6.6 are first-class labellers. Both have validated GPU builds and SLURM/PBS launchers for three DOE platforms: Frontier (AMD MI250X, ROCm), Aurora (Intel PVC, oneAPI), Perlmutter (NVIDIA A100, CUDA). QE produces ~100 binaries (pw.x, ph.x, epw.x, ...). VASP supports scf, relax, vc-relax, and vc-relax-shape run types. ACTIVE-LEARNING LOOP matsim-agents al run CONFIG.yaml drives an iterative HydraGNN-DFT loop: MD generates candidates → ensemble/MC-dropout uncertainty selects the most informative → DFT labels them in parallel inside one allocation → dataset grows → HydraGNN retrains → repeat. DFT backend is a single YAML toggle (dft.backend: vasp | qe). LLM-generated seed structures are supported (no curated POSCAR library needed). Config uses ${VAR}, ${VAR:-default}, ${VAR:?msg} shell-style substitution for cross-user/cross-site portability. LLM BACKENDS Ollama (local, default), vLLM (HPC multi-GPU serving), OpenAI, Anthropic, HuggingFace Transformers+Accelerate. Selected at runtime via flag or env var with no code changes. HPC PORTABILITY Same Python entry points run on Frontier (ROCm 7.2), Aurora (oneAPI), and Perlmutter (CUDA 12). DFT and ML stacks are never co-loaded in the same shell; they couple through the scheduler and filesystem. Advanced multi-node launchers (serve, discovery-chat, single-relaxation, active-learning, QE warm-start) are provided for all three platforms. CODABENCH COMPETITION BUNDLE A self-contained benchmark: 159 atomistic test structures across 11 material classes, 5 tasks (formation energy, forces, ML relaxation, AI-DFT relaxation, phase stability ranking), public/private leaderboard split (30/70), and four ready-to-run baselines: MACE-MP-0, HydraGNN, UMA, AllScAIP.

Lupo Pasini, Massimiliano [Oak Ridge National Labo↗