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High-Temperature Thermodynamics Modeling of Graphite

Journal Article · · Applied Sciences
DOI:https://doi.org/10.3390/app12157556· OSTI ID:1891722

We present high-temperature thermodynamic properties for graphite from first-principles anharmonic theory. The ab initio electronic structure is obtained from density-functional theory coupled to a lattice dynamics method that is used to model anharmonic lattice vibrations. This combined approach produces free energies and specific heats for graphite that compare well with available experiments and results from models that empirically represent experimental data, such as CALPHAD. We show that anharmonic theory for the phonons is essential for accurate thermodynamic quantities above about 1000 K.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1891722
Report Number(s):
LLNL-JRNL-836516; 1055532
Journal Information:
Applied Sciences, Journal Name: Applied Sciences Journal Issue: 15 Vol. 12; ISSN 2076-3417
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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