Microwave sintered lead-free ferroelectrics with colossal dielectric constant at optical frequency

Relative Investigation on Microwave-Assisted Zr-Modified PbTiO3 and BaTiO3 Ferroelectric Ceramics for Energy Storage Application

“…22,30 The decrease in ϵ r value after Curie transition temperature in ferroelectric ceramics attributes to the disorientation of the thermally agitated dipoles from the applied electric field. 15,31 The microwave sintered BZT exhibits a similar trend for tan δ versus temperature and a relaxation peak is noticed at T c . Both BZT and PZT ceramics exhibits dielectric relaxation which is attributed to the thermally activated ferroelectric dipoles.…”

“…A maximum ϵ r value of 12,200 is observed at 31 °C at 1 MHz owing to sharp ferro to para phase transition at this temperature, beyond which the dielectric constant decreases (as shown in Figure ). Similar results are observed in previous reports. , The decrease in ϵ r value after Curie transition temperature in ferroelectric ceramics attributes to the disorientation of the thermally agitated dipoles from the applied electric field. , The microwave sintered BZT exhibits a similar trend for tan δ versus temperature and a relaxation peak is noticed at T c . Both BZT and PZT ceramics exhibits dielectric relaxation which is attributed to the thermally activated ferroelectric dipoles.…”

A graphene oxide decorated BZT–CNF composite through hybrid microwave processing: an advanced multifunctional material for superior microwave shielding applications

“…The porosity in the composites is estimated with the help of the relative density of the composites. 41 It is found that the increase of GO content in the magnetoelectric composite enhances the densification and reduces the porosity in the composites. The average crystallite size, dislocation density, and structural features of GO-reinforced BZT–CNF magnetoelectric composites are estimated by applying the Scherer approach.…”

“…The absorption spectra of 0.5CNF-0.5BZT exhibit two peaks at 255 nm and 330 nm representing ferromagnetic and ferroelectric materials, respectively. 37,41 Upon the introduction of GO in the magnetoelectric composite in different concentrations, a slight blue shi in absorption peaks is noticed, which might be explained with the help of the quantum connement effect. 44 For GO-introduced magnetoelectric composites, the optical absorption coefficient (a) is calculated 45 and the band gap energy is estimated through the Kubelka-Monk function using eqn (1).…”