article published yes Michael Friedrich author Arno Schindlmayr author 4580000-0002-4855-071X Wolf Gero Schmidt author 4680000-0002-2717-5076 Simone Sanna author 295 department 296 department 230 department 429 department 15 department 35 department 27 department Computing Resources Provided by the Paderborn Center for Parallel Computing project TRR 142 project TRR 142 - Project Area B project TRR 142 - Subproject B4 project Computing Resources Provided by the Paderborn Center for Parallel Computing project The phonon dispersions of the ferro‐ and paraelectric phase of LiTaO3 are calculated within density‐functional perturbation theory. The longitudinal optical phonon modes are theoretically derived and compared with available experimental data. Our results confirm the recent phonon assignment proposed by Margueron et al. [J. Appl. Phys. 111, 104105 (2012)] on the basis of spectroscopical studies. A comparison with the phonon band structure of the related material LiNbO3 shows minor differences that can be traced to the atomic‐mass difference between Ta and Nb. The presence of phonons with imaginary frequencies for the paraelectric phase suggests that it does not correspond to a minimum energy structure, and is compatible with an order‐disorder type phase transition. https://ris.uni-paderborn.de/download/10025/18577/pssb.201552576.pdf application/pdf Wiley-VCH2016 eng 0370-1972 1521-3951 00037414250001510.1002/pssb.201552576 2534683-689 Friedrich, M., Schindlmayr, A., Schmidt, W. G., &#38; Sanna, S. (2016). LiTaO3 phonon dispersion and ferroelectric transition calculated from first principles. <i>Physica Status Solidi B</i>, <i>253</i>(4), 683–689. <a href="https://doi.org/10.1002/pssb.201552576">https://doi.org/10.1002/pssb.201552576</a> M. Friedrich, A. Schindlmayr, W. G. Schmidt, and S. Sanna, “LiTaO3 phonon dispersion and ferroelectric transition calculated from first principles,” <i>Physica Status Solidi B</i>, vol. 253, no. 4, pp. 683–689, 2016, doi: <a href="https://doi.org/10.1002/pssb.201552576">10.1002/pssb.201552576</a>. M. Friedrich, A. Schindlmayr, W.G. Schmidt, S. Sanna, Physica Status Solidi B 253 (2016) 683–689. Friedrich, Michael, Arno Schindlmayr, Wolf Gero Schmidt, and Simone Sanna. “LiTaO3 Phonon Dispersion and Ferroelectric Transition Calculated from First Principles.” <i>Physica Status Solidi B</i> 253, no. 4 (2016): 683–89. <a href="https://doi.org/10.1002/pssb.201552576">https://doi.org/10.1002/pssb.201552576</a>. Friedrich, Michael, et al. “LiTaO3 Phonon Dispersion and Ferroelectric Transition Calculated from First Principles.” <i>Physica Status Solidi B</i>, vol. 253, no. 4, Wiley-VCH, 2016, pp. 683–89, doi:<a href="https://doi.org/10.1002/pssb.201552576">10.1002/pssb.201552576</a>. Friedrich M, Schindlmayr A, Schmidt WG, Sanna S. LiTaO3 phonon dispersion and ferroelectric transition calculated from first principles. <i>Physica Status Solidi B</i>. 2016;253(4):683-689. doi:<a href="https://doi.org/10.1002/pssb.201552576">10.1002/pssb.201552576</a> @article{Friedrich_Schindlmayr_Schmidt_Sanna_2016, title={LiTaO3 phonon dispersion and ferroelectric transition calculated from first principles}, volume={253}, DOI={<a href="https://doi.org/10.1002/pssb.201552576">10.1002/pssb.201552576</a>}, number={4}, journal={Physica Status Solidi B}, publisher={Wiley-VCH}, author={Friedrich, Michael and Schindlmayr, Arno and Schmidt, Wolf Gero and Sanna, Simone}, year={2016}, pages={683–689} } 100252019-05-29T07:52:52Z2025-12-05T09:58:55Z