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Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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

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Periodically-arrayed ferroelectric nanostructures induced by dislocation structures in strontium titanate.

Kairi Masuda¹, Le Van Lich, Takahiro Shimada

¹Department of Mechanical Engineering and Science, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan. masuda.kairi.64n@st.kyoto-u.ac.jp.

Physical Chemistry Chemical Physics : PCCP

|October 2, 2019

Summary

Dislocations in strontium titanate create periodic ferroelectric nanostructures. This discovery offers a new method for fabricating advanced ferroelectric nanodevices.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Dislocations in incipient ferroelectric SrTiO3 induce local ferroelectricity.
These ferroelectric regions form one-dimensional nanostructures around dislocations.
Periodic arrays of dislocations can lead to ordered microstructures like dislocation walls.

Purpose of the Study:

To investigate the formation and characteristics of ferroelectric nanostructures induced by dislocations in SrTiO3.
To explore the potential of dislocations for fabricating periodically-arrayed ferroelectric nanostructures.
To understand the role of electro-mechanical coupling and strain concentration in ferroelectric induction.

Main Methods:

Utilizing phase-field simulations to model the behavior of ferroelectricity around dislocations.
Analyzing the connection and arrangement of ferroelectric nano-regions within dislocation walls.
Characterizing the resulting periodically-arrayed ferroelectric nanostructures.

Main Results:

Ferroelectric nano-regions induced by strain and electric fields around dislocations connect to form continuous structures within dislocation walls.
Phase-field simulations confirm the formation of periodic ferroelectric nano-regions embedded in paraelectric matrices.
The internal structure of these nanostructures dictates their polarization configurations and functionalities.

Conclusions:

Dislocations provide a novel route to engineer periodic ferroelectric nanostructures in SrTiO3.
This approach enables the fabrication of functional ferroelectric nanodevices with tailored properties.
The findings open new avenues for advanced materials design in ferroelectric systems.