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Dielectric and Raman Spectroscopic Studies of Na 0.5 Bi 0.5 TiO 3 – BaSnO 3 Ferroelectric System
Author(s) -
Tripathy Satya Narayan,
Mishra Karuna Kara,
Sen Shrabanee,
Pradhan Dillip K.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12838
Subject(s) - raman spectroscopy , orthorhombic crystal system , tetragonal crystal system , dielectric , phase transition , materials science , perovskite (structure) , analytical chemistry (journal) , permittivity , ferroelectricity , transition temperature , phase (matter) , crystallography , chemistry , crystal structure , condensed matter physics , optoelectronics , optics , physics , superconductivity , organic chemistry , chromatography
A series of lead‐free perovskite solid solutions of (1 − x ) Na 0.5 Bi 0.5 TiO 3 ( NBT )— x BaSnO 3 ( BSN ), for 0.0 ≤ x ≤ 0.15 have been synthesized using a high‐temperature solid‐state reaction route. The phase transition behaviors are studied using dielectric and Raman spectroscopic techniques. The ferroelectric to relaxor phase transition temperature ( T FR ) and the temperature corresponding to maximum dielectric permittivity ( T m ) are estimated from the temperature‐dependent dielectric data. Dielectric studies show diffuse phase transition around ~335°C in pure NBT and this transition temperature decreases with increase in x . The disappearance of x ‐dependence of A 1 mode frequency at ~134 cm −1 for x ≥ 0.1 is consistent with rhombohedral‐orthorhombic transition. In situ temperature dependence Raman spectroscopic studies show disappearance and discontinuous changes in the phonon mode frequencies across rhombohedral ( x < 0.1)/orthorhombic ( x ≥ 0.1) to tetragonal transition.