Ultrahigh strain in site engineering-independent Bi0.5Na0.5TiO3-based relaxor-ferroelectrics

Jie Yin, Chunlin Zhao, Yuxing Zhang, Jiagang Wu

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


In the past, accompanied by the highly asymmetric bipolar strain-electric field (S-E) loop, the ultrahigh strain can be realized in bismuth sodium titanate (BNT)-based ceramics mainly by the B site doping, which seriously restricts the further opening of the research and application scope. Here, regardless of A or/and B sites doping, we observed an ultrahigh unipolar strain response (S = 0.53–0.56% and d33* = 883–933 pm/V, 60 kV/cm) in [Bi0.5(Na0.82-xK0.18Lix)0.5](1-y)Sry(Ti1-zTaz)O3 ceramics by chemical modifications, accompanied by the even higher unipolar strain (∼0.63%, 90 kV/cm) and large field signal (d33* = 990 pm/V, 50 kV/cm). Moreover, the symmetrical bipolar S-E loop is also obtained in this system. In particular, we strictly illuminate the origin of the composition-induced giant strain from the view of the microscopic (A-O bonds weakening), mesoscopic (the coexistence of metastable small-sized ferroelectric domain structures and ergodic relaxor phase), and macroscopic (Tf-r shifting) perspectives. We believe that this work can provide a simple but effective way to optimize the strain behavior in BNT-based ceramics.
Original languageEnglish (US)
Pages (from-to)70-77
Number of pages8
JournalActa Materialia
StatePublished - Feb 6 2018
Externally publishedYes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Metals and Alloys
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials


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