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Evidence of low‐temperature phase transition in BaTiO 3 ‐modified NaNbO 3 : Raman spectroscopy study
Author(s) -
Jauhari Mrinal,
Mishra Sanjay Kumar,
Poswal Himanashu Kumar,
Mittal Ranjan,
Chaplot Samrath Lal
Publication year - 2019
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5739
Subject(s) - raman spectroscopy , phase transition , analytical chemistry (journal) , phase (matter) , hysteresis , materials science , chemistry , condensed matter physics , optics , physics , organic chemistry , chromatography
The solid solution of NaNbO 3 modified by 5% BaTiO 3 (NNBT05) is investigated by Raman spectroscopic technique as a function of temperature from 83 to 298 K. Detailed mode analysis revealed that the Raman bands at ~112.8 and 277.1 cm −1 (at 298 K) disappear due to change in the symmetry of the structure at low temperature of 83 K. Further, rapid changes in the position of the Raman bands at 58.7 and 606.4 cm −1 (at 298 K) as a function of temperature provide evidence for the structural phase transition. These changes in the Raman spectra occur at different temperatures in the cooling and heating cycles as in a hysteresis loop, which provide evidence of the first‐order nature of the phase transition at low temperature.