Tailoring oxide nanoparticle exsolution in La0.5Ba0.5-yCo1-xFexO3-δ

Daria Balcerzak; Andrés López-García; Alfonso Carrillo; Maria Balaguer; Jose M. Serra; Truls Norby; Ragnar Strandbakke; Maria Gazda; Sebastian Lech Wachowski

doi:10.1016/j.jeurceramsoc.2025.117347

Tailoring oxide nanoparticle exsolution in La0.5Ba0.5-yCo1-xFexO3-δ

Abstract

We show that oxide nanoparticles (NPs) exsolve on La0.5Ba0.5-yCo1-xFexO3-δ (x = 0-1, y = 0 or 0.01) in oxidizing conditions. The phenomenon occurs only in Co-containing materials and depends on pO2 and pH2O pressures. Under dry conditions, the smallest NPs average about 30 nm, with 200-300 NPs/µm2 at pO2=5×10-5 atm. For pO2=1 atm, NP size increases to 100-200 nm, and population drops to a few to about 20 NPs/µm2 depending on A-site nonstoichiometry and x. In humid conditions, the smallest NPs around 50 nm, with a peak of 100 NPs/µm2 exsolve for pO2=1. Transmission electron microscopy shows that exsolved NPs in La0.5Ba0.5-yCoO3-δ are Ba-O-rich. We propose defect chemistry models, indicating that exsolution is driven by oxidation reactions forming A-site vacancies, increasing exsolved material with higher pO2. We suggest that adsorbed water under humid conditions blocks nucleation sites, altering observed trends.

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Authors (9)

Daria Balcerzak
Andrés López-García
Alfonso Carrillo Dr
Maria Balaguer Dr
Jose M. Serra
Truls Norby Dr
Ragnar Strandbakke Dr
Maria Gazda prof. dr hab. inż.
Sebastian Lech Wachowski (formerly: Sebastian Wachowski) dr inż.

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Keywords

COBALTITES, OXIDE EXSOLUTION, OXIDE NANOPARTICLES, MIXED PROTONIC-ELECTRONIC CONDUCTORS, POSITRODES

Details

Category:

Articles

Type:

artykuły w czasopismach dostępnych w wersji elektronicznej [także online]

Published in:

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN: 0955-2219

Language:

English

Publication year:

2025

Bibliographic description:

Balcerzak D., López-García A., Carrillo A., Balaguer M., Serra J. M., Norby T., Strandbakke R., Gazda M., Wachowski S., Tailoring oxide nanoparticle exsolution in La0.5Ba0.5-yCo1-xFexO3-δ, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2025,10.1016/j.jeurceramsoc.2025.117347

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