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Ultrahigh electromechanical response from competing ferroic orders.

Baichen Lin1,2, Khuong Phuong Ong3, Tiannan Yang4

  • 1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, Republic of Singapore.

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|September 11, 2024
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Summary
This summary is machine-generated.

Researchers developed ultrahigh electromechanical response materials by combining competing antiferroelectric and ferroelectric orders. This novel approach in sodium niobate thin films achieves high piezoelectric coefficients for advanced electromechanical devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Electromechanical coupling is vital for transducers and acoustic devices, converting mechanical and electrical energy.
  • High electromechanical responses are typically linked to structural instabilities, achieved via morphotropic phase boundaries or nanoscale heterogeneity.

Purpose of the Study:

  • To demonstrate a new strategy for achieving ultrahigh electromechanical response.
  • To induce extreme structural instability by exploiting competing antiferroelectric and ferroelectric orders.

Main Methods:

  • Guided by phase diagrams and theoretical calculations.
  • Designed coexistence of antiferroelectric orthorhombic and ferroelectric rhombohedral phases in sodium niobate thin films.

Main Results:

  • Achieved effective piezoelectric coefficients exceeding 5,000 pm/V.
  • Observed ultrahigh electromechanical response due to electric-field-induced antiferroelectric-ferroelectric phase transitions.

Conclusions:

  • The study presents a general approach to design and utilize antiferroelectric materials.
  • This method enables the creation of materials with ultrahigh electromechanical response for electromechanical devices.