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Updated: Sep 11, 2025

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

Selective Oxidation and Cr Segregation in High-Entropy Oxide Thin Films.

Le Wang¹, Krishna Prasad Koirala¹, Shuhang Wu²

¹Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.

|August 11, 2025

Summary

This summary is machine-generated.

Strontium doping in high-entropy oxides (HEOs) alters chromium oxidation states and causes segregation. Precise control over growth conditions is crucial for tuning HEOs for electrocatalyst applications.

Keywords:

cation migration doping epitaxial thin films high entropy oxides selective oxidation

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Last Updated: Sep 11, 2025

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Fabrication of Spatially Confined Complex Oxides

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Published on: July 1, 2013

Area of Science:

Materials Science
Solid State Chemistry
Nanotechnology

Background:

High-entropy oxides (HEOs) exhibit remarkable compositional flexibility and structural stability.
HEOs are promising candidates for advanced energy and catalytic applications.

Purpose of the Study:

Investigate the impact of strontium (Sr) doping on B-site cation oxidation states, local composition, and structure.
Analyze Sr doping effects in epitaxial La_1-xSr_x(Cr_0.2Mn_0.2Fe_0.2Co_0.2Ni_0.2)O₃ thin films.

Main Methods:

X-ray spectroscopies (e.g., XPS, XAS) to determine cation oxidation states.
Atomic-resolution scanning transmission electron microscopy (STEM) coupled with energy-dispersive X-ray spectroscopy (EDX) for compositional and structural analysis.

Main Results:

Sr doping promotes the oxidation of chromium (Cr) from Cr³⁺ to Cr⁶⁺ and partially oxidizes cobalt (Co) and nickel (Ni).
Manganese (Mn) and iron (Fe) oxidation states remained unchanged (Mn⁴⁺, Fe³⁺).
Significant Cr segregation was observed, with surface enrichment and interface depletion, alongside partial amorphization in heavily doped samples.

Conclusions:

Oxidation-induced migration of smaller, high-valence Cr cations drives segregation during film growth.
Charge compensation, local strain, and compositional fluctuations are critical factors in HEOs.
Tailoring growth conditions is essential for controlling surface composition and electronic structure in HEOs for improved electrocatalyst design.