Raman study for BaTiO3 system doped with various concentrations and treated at different temperatures

Phase Transitions in Nanocrystalline Barium Titanate Ceramics Prepared by Spark Plasma Sintering

“…When BT goes from tetragonal structure into cubic structure, the first‐order band should decrease gradually. With respect to second‐order bands, the case is different and the line frequency cannot be accurately estimated 25 …”

Dependence of Ba(Zr0.1Ti0.9)O3 films growth on substrate temperature upon radio-frequency plasma enhanced pulsed laser deposition

“…2 were measured at room temperature. According to the previous studies [14], from a lower wave number to higher ones, 251, 298, 717 cm À1 are attributed to A 1 (TO 2 ), E (TO 2 +LO 1 ), A 1 (LO 3 ) vibrational modes, respectively, and the A 1 (TO 3 ) phonon mode overlapped with the Si phonon mode of the Si substrate. By Gauss desolution shown in Fig.…”

Synthesis of Pure, Crystalline (Ba,Sr)TiO3 Nanosized Powders in Radio Frequency Induction Thermal Plasma

“…While there are Raman active lattice vibration modes from the tetragonal BaTiO 3 , there is no Raman active mode from the cubic BaTiO 3 29 . The Raman peaks from the tetragonal BaTiO 3 powder are at 880, 720, 515, 305, 260, and 185 cm −1 30,31 . Most of the peaks of the Raman scattering spectrum of BaTiO 3 nanosized powders could be assigned to the tetragonal phase, which has excellent dielectric properties, while a peak at 640 cm −1 could be assigned to the hexagonal phase 32 .…”

“…29 The Raman peaks from the tetragonal BaTiO 3 powder are at 880, 720, 515, 305, 260, and 185 cm À1 . 30,31 Most of the peaks of the Raman scattering spectrum of BaTiO 3 nanosized powders could be assigned to the tetragonal phase, which has excellent dielectric properties, while a peak at 640 cm À1 could be assigned to the hexagonal phase. 32 The hexagonal phase is a high-temperature one, according to the phase diagram, 33 and it also exhibits a giant dielectric constant.…”