Abstract
[(Bi0.5Na0.5)0.94Ba0.06]1-xNaTi1-xNbO3 (x = 0.5 and 0.10) ceramics were prepared via conventional solid-state sintering route. X-ray diffraction analysis of the samples exhibited the formation of the cubic structure. Similar structure was observed from the Raman spectra of the samples. The optical band gap of the samples slightly decreased from 3.08 to 3.06 eV with increasing level of Na+ and Nb5+. The addition of Na+ and Nb5+ shifted Tm towards room temperature (RT). The sample x = 0.05 had a stable relative permittivity ɛr(mid) = 3914 across the temperature range 79-350 ℃ and tanδ < 0.025 (104-279 ℃). The energy density of sample with x = 0.05 was 0.4 J/cm3 which decreased to 0.32 J/cm3 at an applied electric field of 50 kV/cm with further substitution of Na+ and Nb5+ (i.e., x = 0.10).
Highlights
Dielectric materials are extensively used in different electronic applications in the form of capacitors, resistors, nonlinear dielectric thin films, advanced pulsed capacitors etc. [1-3]
Further increasing the amount of NN to x = 0.10, the ceramic had a high value of relative permittivity at mid temperature i.e., ɛr = 2643 ± 15 % (45 - 374 °C) which showed that the lower and upper temperature stability range was improved
X-ray diffraction analysis revealed the formation of single-phase cubic structure which was confirmed from the Raman spectra of the ceramics
Summary
ФІЗИКА І ХІМІЯ ТВЕРДОГО ТІЛА Т. 22, No 4 (2021) С. 607-613 Фізико-математичні науки. Dielectric, Ferroelectric and Optical Properties of Na and Nb co-Doped (Bi0.5Na0.5)0.94Ba0.06TiO3. Dielectric, Ferroelectric and Optical Properties of Na and Nb co-Doped (Bi0.5Na0.5)0.94Ba0.06TiO3. Received 1 Juiy 2021; Accepted 15 September 2021
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