@article{22960,
  abstract     = {{We perform a theoretical analysis of the structural and electronic properties of sodium potassium niobate K1-xNaxNbO3 in the orthorhombic room-temperature phase, based on density-functional theory in combination with the supercell approach. Our results for x=0 and x=0.5 are in very good agreement with experimental measurements and establish that the lattice parameters decrease linearly with increasing Na contents, disproving earlier theoretical studies based on the virtual-crystal approximation that claimed a highly nonlinear behavior with a significant structural distortion and volume reduction in K0.5Na0.5NbO3 compared to both end members of the solid solution. Furthermore, we find that the electronic band gap varies very little between x=0 and x=0.5, reflecting the small changes in the lattice parameters.}},
  author       = {{Bidaraguppe Ramesh, Nithin and Schmidt, Falko and Schindlmayr, Arno}},
  issn         = {{1434-6036}},
  journal      = {{The European Physical Journal B}},
  number       = {{8}},
  publisher    = {{EDP Sciences, Società Italiana di Fisica and Springer}},
  title        = {{{Lattice parameters and electronic band gap of orthorhombic potassium sodium niobate K0.5Na0.5NbO3 from density-functional theory}}},
  doi          = {{10.1140/epjb/s10051-021-00179-8}},
  volume       = {{94}},
  year         = {{2021}},
}

@article{13913,
  author       = {{Liu, Hong}},
  issn         = {{1434-6028}},
  journal      = {{The European Physical Journal B}},
  pages        = {{230}},
  title        = {{{Influence of strong screening effect on the perpendicular- polarized linear excitonic absorption spectra of semiconducting carbon nanotubes}}},
  doi          = {{10.1140/epjb/e2016-70476-8}},
  volume       = {{89}},
  year         = {{2016}},
}