Winiarz Piotr, Dzierzgowski Kacper, Mielewczyk-Gryń Aleksandra, Gazda Maria, Wachowski Sebastian
Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80233, Gdańsk, Poland.
Chemistry. 2021 Mar 22;27(17):5393-5398. doi: 10.1002/chem.202004561. Epub 2021 Feb 24.
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 /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 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 the order of 10 S cm 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.
采用固态合成法合成了正锑酸镧。为提高可能的质子传导率，还制备了在镧位添加1 mol %钙的样品。通过X射线衍射手段对结构进行了研究，结果表明两个样品均为单相。材料在空间群P2 /n中结晶。热膨胀法显示该材料随温度呈非线性膨胀。这种偏差的性质尚不清楚；然而，计算得出的线性分数热膨胀系数为9.56×10 K 。电学性质研究表明，该材料在氧化条件下是质子导体，这在湿空气和干空气中的温度研究以及H/D同位素交换实验中均得到了证实。其电导率相当适中，在800 °C时峰值约为10 S cm ，但通过微观结构和掺杂优化可进一步提高。这是首次报道正锑酸镧中的质子传导率。
