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This research advances materials science by validating a computationally efficient Beyond Quasi-Harmonic (BQH) method for modeling high-temperature properties of conductive ceramics like zirconium carbide. By incorporating electronic heat-capacity corrections, the study achieves accurate predictions that surpass traditional quasi-harmonic approximations without requiring intensive thermodynamic integration. This improvement in simulation accuracy is a significant step forward for machine learning potentials and density functional theory workflows used in materials discovery.

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Indianapolis Team Benchmarks High-Temperature Material Modelling

Quantum Zeitgeist6 octombrie 20263 min de cititArticolul și perspectiva sunt în engleză.

Until now, accurately modelling zirconium carbide’s behaviour above roughly 1200 K demanded computationally intensive techniques like thermodynamic integration. Calculations using the Beyond Quasi-Harmonic (BQH) method, combined with an electronic contribution, closely match these benchmarks for molar heat capacity. This simpler approach successfully accounts for previously neglected atomic vibrations at high temperatures.

A prepared-supercell first-principles approach known as the Beyond Quasi-Harmonic (BQH) method serves as a high-temperature benchmark for extracting anharmonic vibrational energy directly from density-functional-theory energy evaluations. The calculated BQH molar heat capacity is compared with CALPHAD reference values, a fully anharmonic thermodynamic-integration calculation, a calculated C”(T) curve from this work and a quasi-harmonic calculation. The BQH curve demonstrates substantial improvement beyond both C”(T)…

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