4.6 Article

Achieving Large Switchable Polarization and Enhanced Piezoelectric Response in BiFeO3-PbTiO3 Solid Solution Ceramics

Journal

ADVANCED ELECTRONIC MATERIALS
Volume 8, Issue 2, Pages -

Publisher

WILEY
DOI: 10.1002/aelm.202100883

Keywords

domain structure; ferroelectric polarization; high temperature piezoelectrics; morphotropic phase boundary; multiferroics

Funding

  1. Natural Science Foundation of China [12174299, 51911530125, 51602243]
  2. China Postdoctoral Science Foundation [2019M663697]
  3. Ministry of Science and Higher Education of the Russian Federation [0852-2020-0032, BAS0110/20-3-08IF]
  4. 111 Project of China [B14040]
  5. U. S. Office of Naval Research (ONR) [N00014-16-1-3106, N00014-12-1-1045]
  6. Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2017-06915]
  7. Shanghai synchrotron radiation facilities (SSRF) beamline [BL02U2]

Ask authors/readers for more resources

A simple modified mixed-oxide reaction method was developed to prepare Dy- and Sm-modified BFPT ceramics with significantly improved properties, showing well-saturated ferroelectric hysteresis loops and enhanced piezoelectric properties suitable for high-temperature applications. The enhanced dielectric/piezoelectric properties were mainly attributed to intrinsic mechanisms of polarization rotation/extension, with minimal extrinsic contributions from interphase and domain walls.
Perovskite materials based on BiFeO3-PbTiO3 (BFPT) solid solutions are promising for various applications thanks to the extremely large spontaneous polarization (P-s) and existence of multiferroic morphotropic phase boundary. For applications in piezoelectric and memory devices, complete switching of P-s is needed, which is hard to achieve practically. In this work, a simple modified mixed-oxide reaction method is developed allowing to prepare Dy- and Sm-modified BFPT ceramics with significantly improved properties. The MPB compositions demonstrate well-saturated ferroelectric hysteresis loops with large switchable remanent polarization of 60 mu C cm(-2) and enhanced piezoelectric properties with a large-signal piezoelectric coefficient d(33)* = 214 pm V-1 and a direct piezoelectric coefficient d(33) = 128 pC N-1, which is one and a half times larger than the best d(33) value reported for the BFPT ceramics so far. The Curie temperature reaches 539 degrees C, suggesting a potential for high-temperature applications. The domain structure is studied by piezoresponse force microscopy. It is found that the enhanced dielectric/piezoelectric properties are mainly due to polarization rotation/extension (intrinsic) mechanism, while the extrinsic contributions of the interphase and domain walls are virtually absent. The strategies for improvement of properties of BFPT and related materials are proposed.

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