Mechanism of Reaction between Lanthanum Manganite and Yttria‐Stabilized Zirconia
Mechanism of Reaction between Lanthanum Manganite and Yttria‐Stabilized Zirconia
复制标题
亚锰酸镧与氧化钇稳定氧化锆的反应机理
DOI：
10.1111/j.1151-2916.1992.tb08193.x
复制
发表时间：
1992
影响因子：
3.9
通讯作者：
H. Yamamura
中科院分区：
文献类型：
--
作者：
H. Taimatsu;K. Wada;H. Kaneko;H. Yamamura
研究了La_（1-x）Ca_xMnO_3（x= 0，0.1，0.2）与ZrO_2 - 8mol%Y_2 O_3（YSZ）在1300° ~ 1425°C空气中的反应。Ca取代LaMnO_3中的La降低了与YSZ的反应活性。一个层的La 2 Zr 2 O 7形成在La 1-xCaxMnO 3/YSZ界面诱导期后，和它的形成加速时，La 1-xCaxMnO 3相是多孔的。反应通过La、Mn和/或Ca离子（主要是Mn离子）单向扩散到YSZ中而进行。用LaMnO_3/单晶YSZ偶估算的La、Mn离子在YSZ中的扩散系数远低于氧离子的扩散系数。根据实验数据，提出了反应机理。
The reaction of La1-xCaxMnO3 (x= 0, 0.1, 0.2) with ZrO2-8 mol% Y2O3 (YSZ) has been investigated at temperatures ranging from 1300° to 1425°C in air. Substitution of Ca for La in LaMnO3 depresses the reactivity with YSZ. A layer of La2Zr2O7 is formed at the La1-xCaxMnO3/YSZ interface after an induction period, and its formation is accelerated when the La1-xCaxMnO3 phase is porous. The reaction proceeds by unidirectional diffusion of La, Mn, and/or Ca ions, mainly Mn ions, into YSZ. The diffusion coefficients of La and Mn ions in YSZ, which are estimated using a LaMnO3/single-crystal YSZ couple, are much lower than that of oxygen ion. From the experimental data, a reaction mechanism is proposed.