Swift heavy ion induced material modifications in Ba1‐xSrxTiO3 ceramics as probed by temperature‐dependent R aman spectroscopy

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EarlyView Article

  • Published: Nov 27, 2017
  • Author: P.K. Bajpai, C.R.K. Mohan, Ratnamala Ganjir, Ravi Kumar, Ashok Kumar, R.S. Katiyar
  • Journal: Journal of 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.

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