Stability of AB 1 / 2 ′ B ″ 1 / 2 O 3 ‐ Type Mixed Perovskite Proton Conductors
Stability of AB 1 / 2 ′ B ″ 1 / 2 O 3 ‐ Type Mixed Perovskite Proton Conductors
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DOI：
10.1149/1.1392648
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发表时间：
1999-12
影响因子：
3.9
通讯作者：
S. V. Bhide;A. Virkar
中科院分区：
文献类型：
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作者：
S. V. Bhide;A. Virkar
以BaCO 3、B' 2 O3和B 2 O 5为原料，在空气中煅烧，合成了A2 B' BO 6（AB' 1/2 B 1/2 O3）型钙钛矿，其中A为Ba +2，B'和B分别为三价和五价离子. X射线衍射证实了合成的每个样品中钙钛矿相的形成。将煅烧后的粉末在水中煮沸以检查它们在水中的稳定性。发现所有混合的钙钛矿都是稳定的。BaCeO 3和BaPrO 3在沸水中分解，而BaZrO 3在沸水中稳定。计算了简单钙钛矿和混合钙钛矿的Madelung能量。与ABO 3型的简单钙钛矿（例如BaCeO 3和BaPrO 3，其中B是四价离子）相比，混合钙钛矿的更高稳定性基于混合钙钛矿的较低Madelung能量而合理化。
Several mixed perovskites of the type A 2 B'BO 6 (AB' 1/2 B 1/2 O 3 ), where A is Ba +2 and B' and B are trivalent and pentavalent ions, respectively, were synthesized by calcining requisite mixtures of BaCO 3 , B' 2 O 3 , and B 2 O 5 in air. X-ray diffraction confirmed the formation of the perovskite phase in each of the samples synthesized. The as-calcined powders were boiled in water to examine their stabilities in water. All mixed perovskites were found to be stable. By contrast, BaCeO 3 and BaPrO 3 decomposed when boiled in water while BaZrO 3 was found to be stable. Madelung energies of simple and mixed perovskites were computed. The higher stability of mixed perovskites compared to simple perovskites of the type ABO 3 , such as BaCeO 3 and BaPrO 3 , where B is a tetravalent ion, was rationalized on the basis of lower Madelung energies of mixed perovskites.