Question on Virtual Crystal Approx.(VCA)

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SUMMARY

The discussion focuses on the implementation of Virtual Crystal Approximation (VCA) for first-principle calculations in disordered systems. The user seeks guidance on parameter settings when using methods such as Plane-Wave Pseudopotential, FPLMTO, and FPLAPW, particularly when dealing with different atom types, A and B, in a disordered structure A(1-x)Bx. A suggested approach includes linearly interpolating lattice constants and atomic pseudopotentials while introducing an empirical parameter to align with experimental data.

PREREQUISITES
  • Understanding of Virtual Crystal Approximation (VCA)
  • Familiarity with Plane-Wave Pseudopotential method
  • Knowledge of FPLMTO and FPLAPW techniques
  • Basic principles of first-principle calculations in solid-state physics
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  • Research the implementation of Virtual Crystal Approximation in computational materials science
  • Learn about parameter optimization techniques for Plane-Wave Pseudopotential calculations
  • Explore the use of empirical parameters in fitting computational results to experimental data
  • Investigate the effects of disordered structures on electronic properties using FPLMTO and FPLAPW methods
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Researchers and practitioners in computational materials science, particularly those working on disordered systems and first-principle calculations using VCA.

leoant
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Dear all,
I am now intended to do some first-principle calculations on disordered system, where VCA is an effective method. However, as to practical implementation using different methods, say Plane-Wave Pseudopotential, FPLMTO, FPLAPW, it's a litter hard to get a clear picture about how to set some parameters, the main reason, I think, is that if one consider two different kind of atoms, say A and B, it's hard to get the electron configuration when two atoms form disordered structure A(1-x)Bx. Is anyone here has done some similar work on this area, and would you please give any advice on how to deal with the problem?
Thanks.
Regards.
 
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What I did was linearly interpolating lattice constants and atomic pseudopotentials with introducing another empirical parameter to fit to experimental data.
 

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