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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Strain-induced lead-free morphotropic phase boundary.

Reza Ghanbari1, Harikrishnan Kp2, Kinnary Patel3

  • 1Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA.

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|August 20, 2025
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Summary
This summary is machine-generated.

Strain engineering in lead-free sodium niobate thin films creates unique nanodomain structures. This enables enhanced dielectric properties and multi-state switching for advanced electronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Enhanced properties in ferroelectrics often occur near phase boundaries.
  • Chemical tuning in lead-free ferroelectrics like (K,Na)NbO3 is difficult due to volatile alkali metals.
  • Lead-based ferroelectrics show high responses but raise environmental concerns.

Purpose of the Study:

  • To demonstrate strain-induced phase boundary structures in lead-free NaNbO3 thin films.
  • To investigate the resulting nanodomain structures and their impact on functional properties.
  • To explore alternatives for achieving high performance in lead-free ferroelectric materials.

Main Methods:

  • Epitaxial thin-film growth of NaNbO3.
  • Ab initio simulations for theoretical insights.
  • Scanning probe microscopy and electron ptychography for structural analysis.
  • Synchrotron X-ray diffraction for phase identification.

Main Results:

  • Revealed strain-induced morphotropic phase boundary-like polymorphic nanodomain structures.
  • Identified coexisting monoclinic and triclinic phases near the phase boundary.
  • Observed multi-state polarization switching and enhanced dielectric susceptibility and tunability.
  • Demonstrated functionality across a broad frequency range.

Conclusions:

  • Strain engineering is a viable strategy for creating functional nanodomain structures in lead-free ferroelectrics.
  • The coexisting phases facilitate field-driven polarization rotation and enhanced properties.
  • This work offers a pathway for developing lead-free thin films with superior performance for next-generation devices.