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A benchmark study of force fields implemented in CSD software
Lily M Hunnisett1, Pietro Sacchi1, Andrew G P Maloney1
1The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ UK.
Structural Chemistry
|May 19, 2026
Summary
This study benchmarks five force fields for crystal structure energy calculations. UNI, CSD-OPCS16, and CLP force fields show the best accuracy for sublimation enthalpies, aiding force field selection for energetic studies.
Area of Science:
- Crystallography and Materials Science
- Computational Chemistry
- Chemical Physics
Background:
- Accurate prediction of crystal lattice energies is crucial for understanding material properties.
- General-purpose force fields are widely used but their performance varies across different chemical systems.
- Evaluating force field performance against experimental data is essential for reliable computational studies.
Purpose of the Study:
- To benchmark the performance of five common force fields (CLP, UNI, CSD-OPCS16, DreidingII, Momany) in the CSD Software.
- To assess their ability to reproduce experimental sublimation enthalpies and relative polymorph stabilities.
- To provide guidance on selecting appropriate force fields for energetic studies in crystallography.
Main Methods:
- Benchmarking study using a dataset of 664 crystal structures from the Cambridge Structural Database (CSD).
- Evaluation of force field performance based on reproduction of experimental sublimation enthalpies.
- Analysis of crystal structure optimization using a new force field-based optimizer.
- Comparison with DFT data to assess the reproduction of relative polymorph stabilities.
Main Results:
- UNI (11%), CSD-OPCS16 (13%), and CLP (13%) force fields demonstrated the smallest overall errors in reproducing sublimation enthalpies.
- DreidingII (22%) and Momany (26%) force fields showed larger errors, which were reduced by structural optimization.
- No single force field excelled across all chemical compound classes; accuracy is system-dependent.
- General-purpose force fields are limited in predicting small energy differences between polymorphs.
Conclusions:
- The UNI, CSD-OPCS16, and CLP force fields offer better accuracy for sublimation enthalpy calculations.
- Force field performance is highly dependent on the specific chemistry of the system under investigation.
- Careful selection of force fields is necessary for accurate energetic studies, especially for polymorph stability predictions.
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