Effect of alkaline-doping on the properties of La2Mo2O9 fast oxygen ion conductor
Effect of alkaline-doping on the properties of La2Mo2O9 fast oxygen ion conductor
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DOI：
10.1039/b410437d
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发表时间：
2004-12
影响因子：
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通讯作者：
C. Tealdi;G. Chiodelli;L. Malavasi;G. Flor
中科院分区：
文献类型：
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作者：
C. Tealdi;G. Chiodelli;L. Malavasi;G. Flor
采用改进的Pechini法合成了纯La_2Mo_2O_9和碱掺杂的（Na，K，Rb）La_2Mo_2O_9（LAMOX）。用该方法制备的LAMOX材料的电导率与固相法制备的材料完全相似。K和Rb的掺杂阻碍了在580 °C附近纯材料和Na掺杂材料中发现的α → β相变。作为pO2函数的电学测量表明，LAMOX在低至10−18 atm时主要具有离子电导率。对于高于约600 °C的温度，掺杂样品的电导率接近于纯铌的电导率，而对于K和Rb掺杂的样品，由于没有相变，电导率在较低温度下更高。最后，观察到的所有调查的样品和相关的非Arrhenius行为，在第一近似，到LAMOX家庭的结构特点。
Synthesis by means of a modified Pechini method of pure and alkaline-doped (Na, K and Rb) La2Mo2O9 (LAMOX) is presented. The electrical conductivity of LAMOX prepared by this method is completely analogous to that of the solid state prepared material. Doping with K and Rb hinders the α → β phase transition found in the pure and Na-doped material around 580 °C. Electrical measurements as a function of pO2 shows that LAMOX has a mainly ionic conductivity down to 10−18 atm. The electrical conductivity of the doped samples is close to that of the pure molybdate for temperatures higher than about 600 °C, while for K- and Rb-doped samples the conductivity is higher for lower temperatures, as a consequence of the absence of the phase transition. Finally, a non-Arrhenius behaviour is observed for all the investigated samples and correlated, at a first approximation, to the structural peculiarities of the LAMOX family.