Electromechanical properties of (Ba,Sr)(Zr,Ti)O3 ceramics

Abstract

In this work, we report dielectric, piezoelectric and ferroelectric properties of perovskite Ba0.95Sr0.05ZrxTi(1-x)O3 (BSZT, x=0.05, 0.10, 0.15, 0.20) ceramics synthesized by using a solid-state reaction method. It is demonstrated that when the Zr concentration was 5 at% and the sintering temperature was 1400 o C, the BSZT ceramic gives the best overall electromechanical performance, including a large remnant polarization of ~ 12.1 µC/cm 2 , large dielectric constants (εr peak ≈12600, εr RT ≈ 3500) and 1 Certain commercial equipment, instruments, or materials are identified in this paper to adequately specify the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.

Superparaelectric (Ba0.95,Sr0.05)(Zr0.2,Ti0.8)O3 Ultracapacitors

“…Ti (Φ = 50 mm, t = 5 mm, 99.99%), Pt (Φ = 50 mm, t = 3 mm, 99.99%) metal targets were provided by Beijing Goodwill Metal Technology Co. Ltd. The BSZT ceramic target was prepared in‐house via a solid‐state reaction method [ 37 ] with the same shape, size, and purity as those of the LaNiO 3 target.…”

Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics

“…Moreover, the (200) peaks of the BSZT ceramics at 2~45° showed an evolution of the phase structure. When the Zr concentrations were 1% and 2%, the XRD spectra corresponded to a single tetragonal 106°C to 73°C, which is consistent with a decreasing tolerance factor (t) toward t=1 [21,24,25]. The maximum dielectric constant, ε r peak , increased from 8300 to 14000 with the Zr concentration increasing from 1% to 9%.…”

“…Because of the larger ionic radius and atomic weight compared with those of Ti 4+ , Zr 4+ has a smaller mobility than Ti 4+ at the same temperature. With an increasing amount of Zr 4+ ions, the mobility of grain boundaries was reduced, which slowed down the inter-grain diffusion process and hence decreased the grain size [21,23]. Fig.…”

“…Therefore, we chose to fix the Sr concentration at a nominal level of 5% and vary the Zr concentration (x) in our experimental investigations.In our previous work[21], Ba 0.95 Sr 0.05 Zr x Ti (1-x) O 3 (BSZT, x= 0.05, 0.08, 0.10, 0.15, 0.20) ceramics were synthesized by using a solid-state reaction method and a PPT temperature was revealed at about 50 o C in the BSZT ceramic with 5% Zr. This temperature moved up towards T C and became indistinguishable from T C when the Zr concentration reached 10% or above[21]. This result indicates that a rich collection of polymorphs exists in the BSZT ceramics near RT with the Zr concentration between 1% and 10%[4].…”

Preparation and Microstructure of acetate-based lead-free BSZT ferrolectric thin films using sol-gel technique

“…Ferroelectric loops showed a maximum of 22.27 µC/cm 2 saturation polarisation and 5.85 µC/cm 2 remnant polarisation in the BSZT thin films. These obtained values are smaller than that of the bulk ceramic counterpart [13]. The much higher coercive feld (Ec~66.5 kV/cm) might be owing to much smaller grains in the BSZT films in comparison with the bulk ceramic hence there being many more grain boundaries.…”