Stochniol G, Broel S, Naoumidis A, Nickel H
Institute for Materials in Energy Systems (IWE), KFA Forschungszentrum Jülich GmbH, PO Box 1913, D-52 425, Jülich, Germany.
Anal Bioanal Chem. 1996 Jun;355(5-6):697-700. doi: 10.1007/s0021663550697.
LaMnO(3)-based perovskites are used as cathode materials in solid oxide fuel cells (SOFC). A major aspect for their applicability is their chemical inertness in connection with the electrolyte material YSZ (Zr(0.85)Y(0.15)O(1.93)) against zirconate formations. Perovskites with the composition La(y-x)(Sr, Ca)(x)Mn(1-u)Co(u)O(3) (y = 1.0 and 0.95; x = 0- 0.2 and 1; u = 0 and 0.2) were investigated with regard to their reactivity with YSZ at different reaction times and temperatures. Powder mixtures and double-layer reaction couples were used for the investigations. XRD phase analyses, SEM/EDX and EPMA were applied for the characterization of the annealed samples. La-deficient perovskites (y = 0.95) partially substituted by Sr and Ca improve the chemical compatibility of perovskite compositions towards YSZ. Sr-containing perovskites were found to have a higher reactivity than Ca perovskites for La(2)Zr(2)O(7) formation. On the other hand enhanced Ca diffusion into YSZ was observed. Co substitution on Mn lattice sites decreased the chemical compatibility, especially for Sr containing perovskites.
基于LaMnO(3)的钙钛矿被用作固体氧化物燃料电池（SOFC）的阴极材料。其适用性的一个主要方面是它们与电解质材料YSZ（Zr(0.85)Y(0.15)O(1.93)）在锆酸盐形成方面的化学惰性。研究了组成式为La(y - x)(Sr, Ca)(x)Mn(1 - u)Co(u)O(3)（y = 1.0和0.95；x = 0 - 0.2和1；u = 0和0.2）的钙钛矿在不同反应时间和温度下与YSZ的反应活性。研究采用了粉末混合物和双层反应偶。利用XRD相分析、SEM/EDX和EPMA对退火后的样品进行表征。由Sr和Ca部分替代的La缺陷型钙钛矿（y = 0.95）提高了钙钛矿组合物与YSZ的化学相容性。发现含Sr的钙钛矿在形成La(2)Zr(2)O(7)方面比含Ca的钙钛矿具有更高的反应活性。另一方面，观察到Ca向YSZ中的扩散增强。在Mn晶格位置上进行Co替代降低了化学相容性，特别是对于含Sr的钙钛矿。
