High‐Temperature Proton Conduction in LaSbO4. Issue 17 (24th February 2021)

• Record Type: Journal Article
• Authors: Winiarz, Piotr; Dzierzgowski, Kacper; Mielewczyk‐Gryń, Aleksandra; Gazda, Maria; Wachowski, Sebastian
• Is Part Of: Chemistry. Volume 27:Issue 17(2021)
• Page Start: 5393
• Page End: 5398
• Publication Date: 2021-02-24
• Subjects: ceramics -- electrical conductivity -- fast-ion conductors -- proton conducting ceramics -- solid-state reactions; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202004561
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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 P 21 / n . Dilatometry revealed that the material expanded 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 K −1 . 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 the order of 10 −6 S cm −1 at 800 °C, but this could be further improved by microstructure and doping optimization. This is the first time protonic conductivity in lanthanum orthoantimonates is reported. Abstract : Lanthanum orthoantimonate is synthesized using a solid‐state synthesis method. To enhance the possible protonic conductivity, samples with the addition of 1 mol % Ca in La‐site are also prepared and characterized by XRD. Dilatometry reveals that the material expands non‐linearly with the temperature, and electrical properties studies show that the material is a proton conductor in oxidizing conditions.