Na1/2Bi1/2VO3 and K1/2Bi1/2VO3: New Lead-Free Tetragonal Perovskites with Moderate c/ a Ratios

Hajime Yamamoto, Takahiro Ogata, Satyanarayan Patel, Jurij Koruza, Jürgen Rödel, Atanu Paul, Tanusri Saha-Dasgupta, Yuki Sakai, Mitsuru Itoh, Masaki Azuma

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

New lead-free tetragonal perovskites Na1/2Bi1/2VO3 and K1/2Bi1/2VO3 were synthesized under high pressure (6 GPa) and high temperature (1473 K), based on the design of materials optimizing the lone pair effect of the A-site ion and utilizing the Jahn-Teller effect in the B-site V4+. The magnitudes of the c/a ratio and spontaneous polarization, PS, were 1.085 and 108 μC/cm2, respectively (73 μC/cm2 by the point charge model), for Na1/2Bi1/2VO3 and 1.054 and 92 μC/cm2, respectively (56 μC/cm2 by the point charge model), for K1/2Bi1/2VO3, which are comparable to the well-known lead-based ferroelectric PbTiO3. This approach can guide the design of new lead-free ferroelectric and piezoelectric materials.

Original languageEnglish
Pages (from-to)6728-6736
Number of pages9
JournalChemistry of Materials
Volume30
Issue number19
DOIs
Publication statusPublished - 2018 Oct 9

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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