Correlation of crystal structure and optical properties of Ba_0.97Nd_0.0267Ti_(1-x)W_xO₃ perovskite

Abstract

The Ba0.97Nd0.0267Ti(1−x)WxO3 (BNTx) pervoskite with a single phase tetragonal structure was prepared at 900 °C using the Molten salt method.

Effect of Gamma Irradiation on the Structural, Optical, Electrical, and Ferroelectric Characterizations of Bismuth-Modified Barium Titanate Ceramics

“…Figure 3a shows the Raman spectra in the wavelength range 180-830 cm −1 of Bi:BT ceramics along with the corresponding spectral deconvolution in Gaussian peaks at room temperature. According to group theory, in Bi:BT before and after gamma irradiation, the A 1 (TO 2 ) mode was embedded at 245 cm −1 and 244 cm −1 , the sharp E(TO 3 ) mode was at 309 cm −1 and 308 cm −1 , the A 1 (TO 3 ) mode was embedded at 512 cm −1 and 509 cm −1 , and the A 1 (LO 3 ) mode was at 724 cm −1 and 721 cm −1 , which was consistent with observations in the literature [39]. Moreover, the Bi:BT ceramics appeared to exhibit additional modes in the spectra, such as the E(TO 2 ) mode with wavenumbers around 197 cm −1 and 195 cm −1 , which was associated with the shift of the Bi atoms on the Ba-O vibrational modes.…”

“…However, the modes of A 1 (TO 3 ) and E(LO 4 ) were related to the stretching or elongation of the TiO 6 octahedra. Finally, the A 1 (LO 3 ) mode was correlated with octahedral distortion in the ferroelectric phase [39][40][41]. The broadening of the A 1 (TO 3 ) mode after irradiation was due to the overlap of the different modes [42].…”

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

“…Further investigations on the intrinsic property of the compounds were performed. The average Normalized Change (ANC) analysis is described via the following equation [35]:…”

Evaluation of the microstructure, optical properties and hopping conduction mechanism of rare earth doped Ba0.85Ca0.12RE0.03Ti0.90Zr0.04Nb0.042O3 ceramics (RE = Ce3+ and Pr3+)

“…[4][5][6] Concerning the optoelectronic applications, rare earth ions (Ln 3+ ) are useful substituted ions to enhance the functionality of BT. [8][9][10] Commonly, Ln 3+ is used as an activator ion to achieve great luminescence characteristics. Furthermore, Ln 3+ can change the lattice properties and enhance the electrical behavior, in particular in terms of thermal evolution of permittivity and dielectric losses, as well as piezoelectric coef-cients.…”