Ba_0.4Sr_0.6TiO₃/MgO Composites with Enhanced Energy Storage Density and Low Dielectric Loss for Solid‐State Pulse‐Forming Line

Abstract

(100Àx) wt% Ba 0.4 Sr 0.6 TiO 3 Àx wt% MgO composites (10rxr30) were prepared using Ba 0.4 Sr 0.6 TiO 3 powder and nanosized MgO powder (B60 nm) by a solid-state reaction. The energy storage density and dielectric loss were investigated for the purpose of a potential application in solid-state pulse-forming line. The results show that Ba 0.4 Sr 0.6 TiO 3 /MgO composites exhibit a notably enhanced energy density and low dielectric loss, compared with pure Ba 0.4 Sr 0.6 TiO 3 . The enhancement of the energy density is attributed to the notable increase in breakdown strength of the composites and the improvement of dielectric constant stability with regard to electric field. In the case of x 5 30, the samples exhibited a breakdown strength of 33.1 kV/mm, an energy density of 1.14 J/cm 3 , a moderate dielectric constant of 270, and a low dielectric loss of 4 Â 10 À4 .

Tuning of dielectric, pyroelectric and ferroelectric properties of 0.715Bi0.5Na0.5TiO3-0.065BaTiO3-0.22SrTiO3 ceramic by internal clamping

“…Further, it has been reported that glass addition increases the breakdown strength of ceramics which in-turn increases the energy storage capacity. 28,[30][31][32] The energy storage can be further improved by minimizing hysteresis losses. In this regards the reader is referred to numerous studies previously reported in the literature as the scope of the current work is limited.…”

“…In this context a number of studies report that the addition of glass can alter ferroelectric behavior. 28,[30][31][32] Moreover, electric field alter polarization in ferroelectric materials in three distinct regions. (a) Initially when the magnitude of applied field is below the coercive field (E c ), domain growth takes place in the preferentially aligned domains.…”

Improving the breakdown strength of (Mg0.9Zn0.1)2(Ti1−xMnx)O4 ceramics with low dielectric loss

“…In addition, low porosity, homogeneous microstructure, and small grain size are beneficial in improving the E b value [2,9].…”

“…Stoichiometric starting powders composed of (Mg 0.9 Zn 0.1 ) 2 n at a speed of 360 rotation per minute (rpm). The slurry was dried and then calcined in air at 1190 1C for 3 h. After a second round of milling and drying, the calcined powders were uniaxially pressed into the samples under a pressure of 150 MPa.…”

“…High breakdown strength improves reliability and prolongs the working life of machines while low dielectric loss can optimize the falling edge and shape of pulses, especially for narrow pulses at a nanosecond-scale [2].…”