Dielectric properties depend on the crystal structure of perovskite-type RbTaO<sub>3</sub> synthesized at high pressure
We successfully synthesized perovskite-type RbTaO<sub>3</sub> at 1173 K under 4 GPa. RbTaO<sub>3</sub> crystalized as a cubic system (<i>Pm</i>3̄<i>m</i> space group (SG), <i>a</i> = 4.04108(3) Å) at 300 K in contrast to the orthorhombic perovskite-type RbNbO<sub>3</sub> prepared under the same conditions. During the cooling process, it reversibly transformed into a tetragonal phase (SG: <i>P</i>4<i>mm</i>) at 270 K, and into an orthorhombic phase (SG: <i>Amm</i>2) at 80 K. Corresponding to the phase transition, the relative permittivity showed a peak at 270 K with a maximum value of approximately 2000 and a kink at 80 K. This transition scheme is analogous to well-known displacement-type ferroelectrics of BaTiO<sub>3</sub> and KNbO<sub>3</sub>. This is in contrast to KTaO<sub>3</sub>, which retains a cubic system and quantum paraelectric properties at the lowest temperature.
Authors
- Jun‐ichi Yamaura (ORCID: https://orcid.org/0000-0002-8992-9099)
- A. Yamamoto (ORCID: https://orcid.org/0000-0002-9505-2510)
- Hajime Sagayama (ORCID: https://orcid.org/0000-0003-3816-9584)
- Yosuke Hamasaki (ORCID: https://orcid.org/0000-0002-7773-5297)
- Takeharu Kato (ORCID: https://orcid.org/0000-0002-2836-3095)
- K. Murase
Institutions
- National Defence Academy (IN)
- High Energy Accelerator Research Organization (JP)
- Shibaura Institute of Technology (JP)
- Japan Fine Ceramics Center (JP)
- National Defense Academy of Japan (JP)
- The University of Tokyo (JP)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d4dt03207a
- Primary Topic
- Ferroelectric and Piezoelectric Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- University of Tokyo
- Institute for Materials Research, Tohoku University
- Division of Materials Research