Effect of divalent dopants on crystal structure and electrical properties of LaAlO3 perovskite

Te Yuan Chen, Ruo Ying Pan, Kuan Zong Fung

研究成果: Article同行評審

25 引文 斯高帕斯(Scopus)

摘要

Oxide ion solid electrolytes are materials which exhibit high oxide ion conductivity. In this study, inexpensive perovskite-type oxide, LaAlO3 was doped with various types of divalent cations. The objective was to investigate the effect of dopants on the crystal structure and conductivity of LaAlO3. As a result, the solubility of Ca ion into the La cation sublattice was found to be 5 mol% and the solubility of Sr ion could reach 20 mol%. However, only less than 1 mol% Ba ion could be dissolved. In this study, Mg ion was substituted for Al ion in the B-site. The solubility of Mg ion was about 3 mol%. With double doping for A and B parent cations, the addition of Ca, Sr, Ba ion tend to enhance the solubility of Mg ion from 3 to 10 mol%. Although the addition of Mg ion increased the solubility of Ca ion, the solubility of Sr and Ba ion was suppressed. The concentration of oxygen vacancy increases with the increasing amount of divalent cation dopants, within their solubility limits. However, the second phases were found to be stoichiometric compounds without oxygen defects. Thus, the conductivity of second phases was significantly lowered. In the LaAlO3 perovskite systems, the activation energies for ionic conduction were also significantly influenced by the addition of dopants. The activation energy for singly and doubly doped samples, were about 89-108 and 90-126 kJ/mol, respectively, which is lower than that for undoped LaAlO3 (∼127 kJ/mol).

原文English
頁(從 - 到)540-546
頁數7
期刊Journal of Physics and Chemistry of Solids
69
發行號2-3
DOIs
出版狀態Published - 2008 二月

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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