Raman Spectrum of Single-Domain BaTiO3

Abstract

Room-temperatureRaman spectra of high-quality single-domain BaTi03 crystals are reported. The frequencies of the Raman-active long-wavelength optical phonons are determined and shown to be in reasonable agreement with the Lyddane-Sachs-Teller (LST) relation as well as infrared reQectivity data. The eGects of mode damping on the Raman line shape are discussed using a classical lattice-polarization-Quctuation model for the Raman scattering process. Based on this model, it is shown that the soft E mode is overdamped, and at 25'C has an undamped mode frequency A&TO of 36&3 cm~and a damping constant F of 1.1&0.1.The temperature dependence of co~o is given and found to be consistent with the LST relation, The soft A& mode is not observed, but is estimated from the LST relation and infrared reQectivity data to be heavily damped (F=0.5) and to have an undamped mode frequency of 180+10 cm '.

Evidence of an Improper Displacive Phase Transition in Cd2Re2O7Harter1, Kennes2, Chu3 et al. 2018Phys. Rev. Lett.250250View full textAdd to dashboardCite

“…Instead, the reported decrease in the Raman peak frequency near T c is due to a decrease in the lifetime of the phonon rather than a softening of its natural frequency. This new interpretation is fully consistent with the Raman data if we reanalyze the data using a driven damped harmonic oscillator model [22], where the frequency of the resulting Raman peak does not necessarily correspond to the oscillator natural frequencya phenomenon well established in the literature [25,26]. As shown in Fig.…”

Structure and optical properties of [Ba1–xY2x/3](Zr0.25Ti0.75)O3 powders

“…According to the literature [40] describes that the structural organization as well as the polarization mechanisms into the cubic BZT structure are related to the presence of polar [ 6 ]. According to the literature [51,52], these Raman-active modes can be divided into longitudinal (LO) and transverse (TO) components, as a consequence of the long-range electrostatic forces responsible for the lattice ionicity.…”

Influence of ZrO_2 Addition on the Structure and Dielectric Properties of BaTiO_3 Ceramics

“…In the tetragonal (ferroelectric) phase, three A 1 + E phonons arise from the three F 1u modes, whereas one E + B 1 mode comes from the F 2u mode, the so-called "silent mode" since it is neither infrared nor Raman active. These modes further split into longitudinal (LO) and transverse (TO) components due to the long range electrostatic forces associated with lattice iconicity [13]. Room temperature measured Raman spectra of Ba(Ti 1−x Zr x )O 3 (x = 0 ÷ 0.3) ceramics are displayed in Fig.…”