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Article

A Novel, Simple and Highly Efficient Route to Obtain PrBaMn2O5+δ Double Perovskite: Mechanochemical Synthesis

1
Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Universidad de Sevilla, E-41092 Seville, Spain
2
Instituto de Ciencia de Materiales de Sevilla (CSIC-US), E-41092 Seville, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Annie Le Gal la Salle
Nanomaterials 2021, 11(2), 380; https://doi.org/10.3390/nano11020380
Received: 13 January 2021 / Revised: 22 January 2021 / Accepted: 27 January 2021 / Published: 2 February 2021
(This article belongs to the Special Issue Nanomaterials for Solid Oxide Fuel Cells)
In this work, a mechanochemical route was proposed for the synthesis of the PrBaMn2O5+δ (PMBO) double layered perovskite phase. The mechanochemical reaction between Pr6O11, BaO2, and MnO powders with cationic stoichiometric ratios of 1/1/2 for Pr/Ba/Mn was performed using high-energy milling conditions in air. After 150 min of milling, a new phase with perovskite structure and cubic symmetry consistent with the A-site disordered Pr0.5Ba0.5MnO3 phase was formed. When this new phase was subsequently annealed at a high temperature in an inert Ar atmosphere, the layered PrBaMn2O5+δ phase was obtained without needing to use a reducing atmosphere. At 1100 °C, the fully reduced layered PrBaMn2O5 phase was achieved. A weight gain was observed in the 200–300 °C temperature range when this fully reduced phase was annealed in air, which was consistent with the transformation into the fully oxidized PrBaMn2O6 phase. The microstructural characterization by SEM, TEM, and HRTEM ascertained the formation of the intended PrBaMn2O5+δ phase. Electrical characterization shows very high electrical conductivity of layered PBMO in a reducing atmosphere and suitable in an oxidizing atmosphere, becoming, therefore, excellent candidates as solid oxide fuel cell (SOFC electrodes). View Full-Text
Keywords: SOFCs; mechanochemistry; layered double perovskites; sinterability; electrical conductivity SOFCs; mechanochemistry; layered double perovskites; sinterability; electrical conductivity
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MDPI and ACS Style

Garcia-Garcia, F.J.; Sayagués, M.J.; Gotor, F.J. A Novel, Simple and Highly Efficient Route to Obtain PrBaMn2O5+δ Double Perovskite: Mechanochemical Synthesis. Nanomaterials 2021, 11, 380. https://doi.org/10.3390/nano11020380

AMA Style

Garcia-Garcia FJ, Sayagués MJ, Gotor FJ. A Novel, Simple and Highly Efficient Route to Obtain PrBaMn2O5+δ Double Perovskite: Mechanochemical Synthesis. Nanomaterials. 2021; 11(2):380. https://doi.org/10.3390/nano11020380

Chicago/Turabian Style

Garcia-Garcia, Francisco J., María J. Sayagués, and Francisco J. Gotor 2021. "A Novel, Simple and Highly Efficient Route to Obtain PrBaMn2O5+δ Double Perovskite: Mechanochemical Synthesis" Nanomaterials 11, no. 2: 380. https://doi.org/10.3390/nano11020380

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