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Updated: Oct 11, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Exploring the Spatial Control of Topotactic Phase Transitions Using Vertically Oriented Epitaxial Interfaces.

Wenrui Zhang^1,2, Jie Zhang³, Shaobo Cheng⁴

¹Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA. zhangwenrui@nimte.ac.cn.

Nano-Micro Letters

|December 3, 2021

Summary

This summary is machine-generated.

This study uses nanocomposite interfaces to control oxygen vacancies in La_0.7Sr_0.3MnO₃, enabling tunable magnetic and electrical properties through topotactic phase transitions to the brownmillerite phase.

Keywords:

Epitaxial interface Functional oxides Nanocomposite Oxygen vacancy Topotactic phase transition

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Last Updated: Oct 11, 2025

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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Published on: December 4, 2014

Area of Science:

Materials Science
Solid-State Chemistry
Nanotechnology

Background:

Oxygen vacancies significantly influence oxide material properties.
Controlling oxygen vacancy formation is key for inducing topotactic phase transitions.
Topotactic phase transitions alter the oxygen sublattice, impacting functional behavior.

Purpose of the Study:

To demonstrate an epitaxial nanocomposite approach for spatial control of topotactic phase transitions.
To investigate the influence of NiO incorporation on oxygen vacancy formation and distribution in La_0.7Sr_0.3MnO₃ (LSMO).
To tune magnetic and electrical transport properties by controlling the transformed phase distribution.

Main Methods:

Epitaxial nanocomposite fabrication of NiO in LSMO films.
Advanced structural characterizations to analyze interface interactions and phase transformations.
Systematic variation of NiO content as a control parameter.

Main Results:

Ultrahigh density of vertically aligned epitaxial interfaces formed between NiO and LSMO.
Strong interfacial interactions induced a topotactic phase transition from perovskite LSMO to brownmillerite (BM) LSMO.
Tunable magnetic and electrical transport properties achieved by controlling the distribution of the LSMO-BM phase.

Conclusions:

Epitaxial nanocomposite interfaces offer precise spatial control over topotactic phase transitions.
This platform enables versatile design of oxide nanostructures with tailored functionalities sensitive to oxygen vacancies.
The approach provides a pathway for developing advanced functional materials with tunable properties.