Effects from A-site substitution on morphotropic phase boundary and phonon modes of (Pb1–1.5xLax)(Zr0.42Sn0.40Ti0.18)O3 ceramics by temperature dependent Raman spectroscopy

Abstract

The complex perovskite ferroelectric/antiferroelectric of (Pb1−1.5xLax)(Zr0.42Sn0.40Ti0.18)O3 (PLZST) ceramics have been investigated by Raman scattering spectra from 77 to 480 K. It was found that phase transition occurs between La composition of 2.6% and 2.8% for PLZST ceramics. Softing of A1(TO1) mode and dramatic changes of relative strength from E(TO2) mode are observed at morphotropic phase boundary (MPB). Moreover, it was found that MPB characteristic shows a wider and lower trend of temperature region with increasing La composition. This could be ascribed to the diminishment of the energy barrier and increment of A-cation entropy.

Spin-phonon interactions of multiferroic Bi4Ti3O12-BiFeO3 ceramics: Low-temperature Raman scattering and infrared reflectance spectra investigations

“…An aircooled charge coupled device (CCD) (À70 C) with a 1024 Â 256 pixels front illuminated chip was used to collect the scattered signal dispersed on 1800 grooves/mm grating. 10 The Bi 4 Ti 3 O 12 -BiFeO 3 ceramic was mounted into a continuous flow liquid helium cryostat (Oxford cryostat MicrostathiresII system). The temperature can be controlled in the range of 3.6-300 K with a precision of about 0.5 K. Fig.…”

“…As we know, both of Raman scattering and infrared reflectance spectra are nondestructive and attractive probe techniques, which are complementary and can provide some invaluable information on lattice vibrations and structural variations. 10 The information can be used to resolve the question of whether the phonon changes during the magnetic transition mainly arise from spin-reorientation, through spin-phonon coupling, and/or from the structural variations.…”

Inherent optical behavior and structural variation in Na0.5Bi0.5TiO3-6%BaTiO3 revealed by temperature dependent Raman scattering and ultraviolet-visible transmittance

“…6,15,17 Note that the phonon modes can be explained by the variations of frequency, intensity, and full width at half maximum (FWHM) of Raman spectra. 14 Fig. 2 shows the peak and integrated intensity at 285 cm À1 (B-O) as a function of temperature for NBT-6%BT.…”

Electronic structures and abnormal phonon behaviors of cobalt-modified Na0.5Bi0.5TiO3-6%BaTiO3 single crystals

“…Besides, interband critical points (CPs), obtained from optical ellipsometry data, have shown efficiency in exploring phase transition of ferroelectrics. 12,13 Similarly, as a nondestructive characterization technique, Raman scattering is sensitive to symmetry disturbance and can provide precise information about ionic configurations and local distortions in materials, 15 which has been applied as a crucial tool for investigating phase transition in ferroelectrics. 4,14,15 Based on the spectral analysis, the phonon modes can be explained by the variations of frequency, intensity, and full width at half maximum (FWHM).…”

“…8,9 Furthermore, optical spectra have been proven to be a powerful approach to investigate related issues on local configurations and phase transition. [12][13][14][15] Optical ellipsometry, has been considered as a novel and powerful technique to investigate the thickness and complex dielectric function (ε=ε 1 +iε 2 ) of a studied system. Besides, interband critical points (CPs), obtained from optical ellipsometry data, have shown efficiency in exploring phase transition of ferroelectrics.…”