期刊
DALTON TRANSACTIONS
卷 43, 期 17, 页码 6490-6499出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3dt53604a
关键词
-
资金
- Junta de Andaluc a (Spain) [P10-FQM-6680]
Lanthanum tungstates, La6WO12, are mixed ion proton-electronic conductors with very interesting properties for technological applications and better phase stability compared to alkaline earth perovskites. A new series of compounds La27.04-xMxW4.96O55.44-x/2 square(8.56+x/2) (M = Ca2+, Sr2+ and Ba2+) are investigated with the aim of increasing the concentration of oxygen vacancies and studying their effects on the structure and transport properties. The materials have been studied by high-resolution laboratory X-ray powder diffraction and scanning electron microscopy combined with energy dispersive spectroscopy (EDS). High temperature X-ray powder diffraction and thermal analysis in wet and dry N-2 gas did not show any evidence of phase transition up to 800 degrees C. The total conductivity was studied by impedance spectroscopy under dry and wet atmospheres and as a function of the oxygen partial pressure. The electronic contribution to the conductivity was determined by the Hebb-Wagner polarization method. The generation of extrinsic vacancies in the lattice with alkaline earth doping leads to a decrease of the ionic conductivity for high doping level, suggesting a proton trapping mechanism.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据