Lead-free (K,Na)NbO3-based ceramics with high optical transparency and large energy storage ability

Qizhen Chai, Dong Yang, Xumei Zhao, Xiaolian Chao, Zupei Yang

Research output: Contribution to journalArticlepeer-review

131 Scopus citations


Highly transparent lead-free (1-x)K0.5Na0.5NbO3–xSr(Zn1/3Nb2/3)O3 (KNN–xSZN) ferroelectric ceramics have been synthesized via a conventional pressureless sintering method. All samples are optically clear, showing high transmittance in the visible and near-infrared regions (~70% and ~80% at 0.5 mm of thickness, respectively). This exceptionally good transmittance is due to the pseudo-cubic phase structure as well as the dense and fine-grained microstructure. In addition, a high energy storage density of 3.0 J/cm3 has been achieved for the 0.94K0.5Na0.5NbO3–0.06Sr(Zn1/3Nb2/3)O3 ceramics with submicron-sized grains (~136 nm). The main reason is likely to be the typical relaxor-like behavior characterized by diffuse phase transition, in addition to the dense and fine-grained microstructure. This study demonstrates that the 0.94K0.5Na0.5NbO3–0.06Sr(Zn1/3Nb2/3)O3 ceramic is a promising candidate of lead-free transparent ferroelectric ceramics for new areas beyond transparent electronic device applications.

Original languageEnglish (US)
Pages (from-to)2321-2329
Number of pages9
JournalJournal of the American Ceramic Society
Issue number6
StatePublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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