Publications Repository - Gdańsk University of Technology

Lanthanum orthoantimonate was synthesized using a solid‐state synthesis method. To enhance the possible protonic conductivity, samples with the addition of 1 mol% Ca in La‐site, were also prepared. The structure was studied by the means of X‐ray diffraction, which showed that both specimens were single phase. The materials crystallized in the space group P2 1 /n. Dilatometry revealed that material expands non‐linearly with the temperature. The nature of this deviation is unknown, however, the calculated linear fraction thermal expansion coefficient was 9.56×10 ‐6 1/K. Electrical properties studies showed that the material is a proton conductor in oxidizing conditions, which was confirmed both by temperature studies in wet in dry air, but also by the H/D isotope exchange experiment. The conductivity was rather modest, peaking at order 10 ‐6 S/cm at 800°C, but this can be further improved by microstructure and doping optimization. This is the first time when protonic conductivity in lanthanum orthoantimonates is reported.

Authors

• dr inż. Piotr Winiarz link open in new tab ,
• dr hab. inż. Aleksandra Mielewczyk-Gryń link open in new tab ,
• dr inż. Kacper Dzierzgowski link open in new tab ,
• prof. dr hab. inż. Maria Gazda link open in new tab ,
• dr inż. Sebastian Wachowski link open in new tab