School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK.
Dalton Trans. 2012 Jan 7;41(1):261-6. doi: 10.1039/c1dt11389e. Epub 2011 Oct 20.
In this paper we report the successful synthesis of the cubic oxyanion containing perovskites, Ba(2)Sc(2-x)P(x)O(5+x) (x = 0.4, 0.5), with the samples analysed through a combination of X-ray diffraction, NMR, TGA, Raman spectroscopy and conductivity measurements. Conductivity measurements indicate a p-type contribution to the conductivity in oxidizing conditions at elevated temperatures, with evidence for proton conduction in wet atmospheres. For the latter, bulk conductivities of 5.9 × 10(-3) and 1.3 × 10(-3) S cm(-1) at 500 °C were obtained for x = 0.4 and 0.5 respectively, comparable to other perovskite proton conductors, while the stability towards CO(2) containing atmospheres was improved compared to BaCeO(3) based systems. Related Si doped systems have also been prepared, although in this case small Ba(2)SiO(4) impurities are observed. We also provide evidence to suggest that "undoped" Ba(2)Sc(2)O(5) contains carbonate groups, which accounts for its thermal instability.
本文报道了成功合成含有立方阴离子的钙钛矿型化合物 Ba(2)Sc(2-x)P(x)O(5+x)（x = 0.4, 0.5），通过 X 射线衍射、NMR、TGA、拉曼光谱和电导率测量对样品进行了分析。电导率测量表明，在高温氧化条件下，存在对电导率的 p 型贡献，在湿气氛中存在质子传导的证据。对于后者，x = 0.4 和 0.5 时，在 500°C 下分别获得了 5.9×10(-3)和 1.3×10(-3) S cm(-1)的体电导率，可与其他钙钛矿质子导体相媲美，而与基于 BaCeO(3)的系统相比，其对含 CO(2)气氛的稳定性得到了提高。还制备了相关的 Si 掺杂体系，但在这种情况下观察到少量的 Ba(2)SiO(4)杂质。我们还提供了证据表明，“未掺杂”的 Ba(2)Sc(2)O(5)含有碳酸盐基团，这解释了其热不稳定性。
