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Updated: Jun 13, 2025

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Published on: March 27, 2018

Tunable Ferroionic Properties in CeO₂/BaTiO₃ Heterostructures.

Milica Vasiljevic¹, Francesco Chiabrera², Denis Alikin³

¹Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark.

ACS Applied Materials & Interfaces

|September 13, 2024

Summary

This summary is machine-generated.

Researchers demonstrate tunable polarization in ceria thin films using ferroelectric interfaces. This ferroionic material approach enables control over water molecule adsorption and splitting for enhanced catalysis.

Keywords:

BTO ceria ferroelectrics ferroionics ionics nanomaterials thin films

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

Area of Science:

Materials Science
Surface Science
Electrochemistry

Background:

Ferroionic materials integrate ferroelectricity with ionic conductivity.
Controlling polarization in thin films is crucial for advanced electronic and catalytic applications.

Purpose of the Study:

To introduce and investigate tunable polarization in cerium dioxide (CeO2-δ) thin films.
To explore the influence of a buried ferroelectric interface on ceria's properties.
To demonstrate the potential for electrochemically enhanced catalysis.

Main Methods:

Fabrication of 5 nm CeO2-δ films on 10 nm BaTiO3 (BTO) ferroelectric films.
Utilizing SrO or TiO2 terminated Nb:SrTiO3 substrates to engineer BTO polarization.
Investigating defect dynamics (oxygen vacancies, polarons) in ceria via interface polarization.
Analyzing surface potential modulation and its effect on water adsorption/ionization.

Main Results:

Ceria thin films replicated the polarization of the buried BTO interface.
Tunable oxidative/reductive (redox) properties were achieved at the ceria surface.
Surface potential inversion modulated water adsorption-desorption and ionization overpotentials by ±400 mV.
Demonstrated control over water molecule interactions based on ceria termination polarity.

Conclusions:

Ferroionic concept successfully applied to tune ceria thin film properties.
Built-in polarization at ferroelectric interfaces offers a method for defect engineering in adjacent oxide layers.
Tunable redox properties of ceria open new avenues for wireless, electrochemically enhanced catalysis.