RT Conference Proceedings
T1 Study of mixed molybdates of lanthanum and praseodymium, La5.4-xPrxMo1-yNbyO12-δ, for H2 separation membranes.
A1 Sánchez Caballero, Abraham
A1 Porras-Vázquez, José Manuel
A1 dos Santos-Gómez, Lucía
A1 Zamudio-García, Javier
A1 Infantes-Molina, Antonia
A1 Marrero-López, David
A1 Ramírez-Losilla, Enrique
K1 Separación por membrana
K1 Hidrógeno
K1 Lantano
K1 Praseodimio
AB This research explores the impact of praseodymium and niobiumdoping on the La5.4-xPrxMo1-yNbyO12- series (x= 1.35, 2.7, 4.05, 5.4; y= 0, 0.1)as materials with mixed proton-ionic conductivity suitable for hydrogenseparation membranes with two main objectives: i) enhancing the electronicconductivity through praseodymium doping, and ii) increasing oxide ionvacancies to improve the ionic conductivity via niobium doping. Material synthesis involves the freeze-drying method, andcharacterization includes X-ray diffraction (Rietveld method), X-rayphotoelectron spectroscopy, scanning and transmission electron microscopyand complex impedance spectroscopy. The symmetry of the materials (cubic orrhombohedral) is influenced by synthetic conditions and composition,compositions with higher praseodymium content exhibit a consistent cubicfluorite-type structure. Optimal conductivity is observed in a nitrogenatmosphere for compositions with high praseodymium content due to thepresence of the Pr4+/Pr3+ pair. In a reducing atmosphere (wet 5%H2-Ar),conductivity significantly decreases due to the reduction of Pr4+ to Pr3+.
YR 2025
FD 2025
LK https://hdl.handle.net/10630/40701
UL https://hdl.handle.net/10630/40701
LA spa
NO Ministerio de Ciencia, Innovación e Universidades
NO PID2021-126009OB-I00
NO TED2021-129836B-I00
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 25 ene 2026