Anharmonic lattice potential. Dec 20, 2022 · We demonstrate this methodology in the ...

Anharmonic lattice potential. Dec 20, 2022 · We demonstrate this methodology in the regime of strongly anharmonic materials which exhibit a multi-well potential energy surface, like cubic SrTiO 3, CsPbBr 3, CsPbI 3, CsSnI 3, and Zr. Ri is the position coordinate of the i th atom, which we now measure from its equilibrium position. The sum over nearest neighbors is denoted (nn). A Apr 17, 2023 · Superionic conductors exhibiting a periodic crystalline lattice and liquid-like ionic conductivity have emerged as promising materials in energy-conversion devices. Its use is straightforward and require only a single ab initio molecular dynamic (AIMD) trajectory. This one is able to capture the explicit thermal effects in solid state physics and to produce a large number of temperature dependent thermodynamic quantities, including the so-called anharmonic effects. Jul 29, 2021 · The parameterized potential is capable of predicting the thermal and vibrational properties of both Pnma and Cmcm phases simultaneously. Jan 4, 2022 · Phonon-phonon scattering mechanisms become important and limit the phonon lifetimes. Features General Extraction of harmonic and anharmonic force constants based on the supercell approach Applicable to any crystal structures and low-dimensional Nov 13, 2020 · Our work aims to fill this gap in understanding of phonon properties of this material and possibly elucidate the role of mode potential in anharmonic lattice dynamics of other crystals. To validate the performance of the potential, the predicted temperature-dependent lattice constants, phase-transition temperature, and phonon dispersion are compared with first-principles and experimental results. eyrj qnk hjhaz ntmfe msajw uuiqbnrom svlc sifh zttu vdznwke