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Benchmarking DFT approximations for studying apatites.

Aritri Roy1, Bikash Kanungo2, Puneet Kumar Patra3

  • 1Advanced Technology Development Centre, Indian Institute of Technology Kharagpur, West Bengal, 721302, India. aritrits@kgpian.iitkgp.ac.in.

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|November 26, 2024
PubMed
Summary
This summary is machine-generated.

This study benchmarks density functional theory (DFT) methods for apatite research. The optB86b-vdW functional with dispersion corrections is recommended for accurate predictions of apatite properties.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Experimental studies on apatite properties are limited.
  • Density functional theory (DFT) is increasingly used for predictions.
  • DFT approximations can lead to deviations from experimental results.

Purpose of the Study:

  • To benchmark various DFT methods for studying apatites.
  • To identify the optimal combination of exchange-correlation (XC) functionals, pseudopotentials (PPs), and basis sets.
  • To improve the accuracy of DFT predictions for apatite properties.

Main Methods:

  • Comprehensive benchmarking of 16 XC functionals (with dispersion corrections), 5 PPs, and 2 basis sets.
  • Comparison of predicted lattice parameters, elastic constants, bulk modulus, and band gap for hydroxyapatite, fluorapatite, and chlorapatite.
  • Analysis of the influence of XC approximations and dispersion corrections on property predictions.

Main Results:

  • Property predictions showed weak sensitivity to the choice of PP and basis set.
  • XC approximations and dispersion corrections significantly impact prediction accuracy.
  • The optB86b-vdW functional demonstrated the best agreement with experimental data.

Conclusions:

  • Dispersion corrections are recommended for studying apatites using DFT, with careful consideration.
  • The optB86b-vdW functional is identified as the most accurate for apatite property prediction.
  • Understanding XC functional behavior is crucial for reliable DFT studies of apatites.