Swift heavy ion induced material modifications in Ba_1‐xSr_xTiO₃ ceramics as probed by temperature‐dependent Raman spectroscopy

Abstract

Effect of 100 MeV O8+ swift heavy ion (SHI) irradiation on phonon properties of Ba1‐xSrxTiO3 (x = 0.10, 0.15) ceramics are probed using Raman spectroscopy. Temperature‐dependent Raman spectra in the range (100 °C to −190 °C) have been investigated, and deconvoluted Raman modes parameters are used in pristine and irradiated ceramics to understand the effect of ion irradiation on phonon modes. Raman bands are successfully identified that discern changes in band parameters during transition from cubic → tetragonal → orthorhombic → rhombohedral phases. Raman spectral analysis reveals that the phase transition sequence remains almost unaffected after SHI irradiation; however, band parameters (band positions, band intensity, and line widths) of some phonon modes show changes after SHI irradiation. Results are interpreted in terms of grain reorientation and oxygen vacancies annihilation due to irradiation. Comparisons of ferroelectric properties in pristine and irradiated ceramics unambiguously reveal that surface or near surface material modifications influence the bulk properties of these polar materials.

Local hardening of Raman phonons in BaxSr1−xTiO3 thin films deposited by r.f. sputtering

“…Which, in turn, can excite other modes that are not excited by the red- beam [18,24,28]. Figure 5(b) displays in an enlarged size the 450-550 cm −1 interval of the spectra of figure 5(a), the band outlined at around 500 cm −1 corresponds to the A1(TO 3 )+E(TO) modes [29].…”

Recent advances in linear and nonlinear Raman spectroscopy. Part XIII

“…Bajpai et al used temperature‐dependent Raman spectroscopy as a probe of swift heavy ion induced material modifications in Ba 1−x Sr x TiO 3 ceramics . Nayak and Desa examined the roles of iron and lithium in silicate glasses by Raman spectroscopy .…”

Influence of swift heavy ion irradiations on temperature dependent phononic behavior of epitaxial LaNiO3 thin film

“…[11][12][13] The SHI irradiations have been used to alter the property of many oxide materials including high T c superconductors, colossal magneto resistance (CMR) oxides, and many transition metal oxides owing to their ability of tailor materials properties via controlled introduction of defects in materials by selecting appropriate ion type and energy. [14][15][16][17][18][19][20][21][22] There are reports in the literature where effect of irradiations on the structural, magnetic and electronic properties of LNO have been studied. [23][24][25] Kumar Raman spectroscopy being sensitive to structural distortions and strain, has been used to probe ion irradiation induced defects and their impact on phononic properties of oxide systems.…”

“…[23][24][25] Kumar Raman spectroscopy being sensitive to structural distortions and strain, has been used to probe ion irradiation induced defects and their impact on phononic properties of oxide systems. [17][18][19][20] Hazem et al 17 used Raman spectroscopy to probe the crystalline to amorphous phase transition in irradiated TiO 2 thin film. Varshney et al 18 studied the effect of heavy ion irradiations in polycrystalline thin film of CeO 2 .…”

“…By using structural characterization technique, they reported a phase transformation in TiO 2 from anatase phase to a mixture of rutile and brookite phases with increase in ion irradiation dose. Bajpai et al 20 probed the effect of O 8+ (100 MeV) SHI ions on phononic properties of Ba 1-x Sr x TiO 3 (BST x ) ceramics by using temperature dependent Raman spectroscopy. They found ion irradiation results in induction of strain and annihilation of oxygen vacancies in the structure.…”