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High‐Temperature Proton Conduction in LaSbO 4
Author(s) -
Winiarz Piotr,
Dzierzgowski Kacper,
MielewczykGryń Aleksandra,
Gazda Maria,
Wachowski Sebastian
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004561
Subject(s) - lanthanum , oxidizing agent , conductivity , materials science , analytical chemistry (journal) , microstructure , proton , electrical resistivity and conductivity , thermal conduction , thermal expansion , thermal conductivity , proton conductor , doping , chemistry , inorganic chemistry , composite material , electrode , physics , nuclear physics , organic chemistry , chromatography , quantum mechanics , electrolyte , optoelectronics
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 2 1 / 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.