Effect of CuO modification on dielectric, ferroelectric and piezoelectric properties of lead-free SrBi₄Ti₄O₁₅ ceramics

Abstract

We report a systematic investigation of the structure, micro-structure, dielectric, ferroelectric and piezoelectric properties of CuO added SrBi 4 Ti 4 O 15 ceramics. All the samples were prepared by solid state reaction technique, where the wt% of CuO in SrBi 4 Ti 4 O 15 was varied as x=0, 0.05, 0.2, 0.5. The addition of CuO increased the density of SrBi 4 Ti 4 O 15 ceramics which in turn resulted in the improvement of dielectric, ferroelectric as well as piezoelectric properties. However, no change either in the crystal structure or lattice parameter was observed with CuO addition. Further a dense microstructure with improved electrical properties is expected to be due to liquid phase sintering. Raman spectra and specific heat measurements were also performed for getting further insight into the properties.

Boosting of Magnetic, Ferroelectric, Energy Storage Efficiency, and Piezoelectric Properties of Zn Intercalated SrBi4Ti4O15-Based Ceramics

“…The Curie temperature ( T C ) of materials plays a vital role, as materials lose their complete piezoelectric and ferroelectric properties at a specific T C . The dielectric constant ( ɛ r ) versus temperature plots of pure SBT, SNPBT, and SNPBT: x Zn ceramics ( x = 0.1, 0.15, and 0.2) are shown in Figure 5 a for the temperature range of 0–700 °C, measured for the frequency 100 kHz, where pure SBT has shown the highest ɛ r ~ 2320 at the T C ~ 521 °C, consistent with previous reports [ 37 ]. The pure SNPBT ceramic has shown the ɛ r ~ 2205 at the highest T C of ~ 626 °C, which is similar to already reported information [ 19 ].…”