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Probing Oxygen Defects in Na 0.5 Bi 0.5 TiO 3 Ferroelectric by Micro‐Raman Spectroscopy (Phys. Status Solidi B 7/2018)
Author(s) -
Selvamani Rachna,
Singh Gurvinderjit,
Sathe Vasant,
Tiwari Vidya Sagar
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201870125
Subject(s) - raman spectroscopy , materials science , ferroelectricity , oxygen , oxide , analytical chemistry (journal) , raman scattering , bismuth , dielectric spectroscopy , spectroscopy , optoelectronics , dielectric , chemistry , optics , electrode , electrochemistry , physics , organic chemistry , chromatography , quantum mechanics , metallurgy
Conventional sintering of sodium bismuth titanate Na 0.5 Bi 0.5 TiO 3 (NBT), a well‐known lead‐free ferroelectric material, results in the formation of oxygen vacancies, which leads to increased electrical conductivity, making technical application difficult. Various techniques have been used for oxygen defect analysis, among them impedance spectroscopy, but the highly insulating nature of ferrroelectric oxides requires high temperature for these investigations. Raman spectroscopy, recently used to study the defect‐related vibration modes in graphene and other oxide materials, provides useful information even at room temperature. Gurvinderjit Singh and co‐workers (article no. 1800002 ) use the micro‐Raman scattering technique to observe the oxygen defect‐related vibration mode in NBT. The concentration of oxygen defects is changed by making a solid solution of NBT with BiCrO 3 . The cover figure represents the obtained micro Raman spectra of (1– x )NBT– x BiCrO 3 for different ‘x’ values, i.e. different amount of BiCrO 3 . An anomalous increase in the band intensity between 700 to 900 cm −1 (i.e. shaded region) is due to the presence of oxygen defects. This increase in band intensity signifies the increase in oxygen defect concentration with increase in BiCrO 3 content.