Atomically engineered interfaces yield extraordinary electrostriction

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Electrostriction is a property of dielectric materials causing mechanical deformation under an electric field, typically with minuscule magnitudes.
• Symmetry-breaking at material interfaces presents an opportunity to engineer novel material properties.

Purpose of the Study:

• To engineer a significantly enhanced electrostrictive effect in artificial heterostructures.
• To explore the potential of atomically controlled interfaces in oxide multilayers for novel material properties.

Main Methods:

• Epitaxial deposition of alternating layers of Gd2O3-doped CeO2 and Er2O3-stabilized δ-Bi2O3.
• Atomic-level control of interfaces between oxide layers.
• Theoretical calculations to understand the mechanism of enhanced electrostriction.

Main Results:

• Achieved an electrostriction coefficient of 2.38 × 10^-14 m^2/V^2, exceeding known relaxor ferroelectrics by three orders of magnitude.
• Demonstrated an engineered electrostrictive effect in artificial heterostructures with atomically controlled interfaces.
• Theoretical calculations confirmed coherent strain from interfacial lattice discontinuity as the source of enhanced electrostriction.

Conclusions:

• Artificial heterostructures with engineered interfaces can lead to significantly enhanced electrostriction.
• This work opens new avenues for designing and manipulating electrostrictive materials.
• Potential applications include nano/micro actuation and advanced sensors.