Effect of isovalent doping on grain boundary conductivity for La2Mo2O9 oxide ion conductor: A distribution function of relaxation times approach

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@Article{PAUL:2018:SSI,

• author = "Tanmoy Paul and Yoed Tsur",
• title = "Effect of isovalent doping on grain boundary conductivity for La2Mo2O9 oxide ion conductor: A distribution function of relaxation times approach",
• journal = "Solid State Ionics",
• volume = "323",
• pages = "37--43",
• year = "2018",
• keywords = "genetic algorithms, genetic programming, Oxide ion conductor, Impedance spectroscopy, Grain boundary, Space charge",
• ISSN = "0167-2738",
• DOI = "doi:10.1016/j.ssi.2018.05.011",
• URL = "http://www.sciencedirect.com/science/article/pii/S0167273817307348",
• abstract = "In this work we have studied the effect of grain boundary space charge on oxide ion conductivity of La2-xErxMo2O9 (0.05a lteqa xa lteqa 0.25) ionic conductors. Microstructure is studied by scanning electron microscopy and high resolution transmission electron microscopy. Impedance spectra are analyzed in the frame work of impedance spectroscopy genetic programming method. A distribution function of relaxation times model is obtained, which is comprised of two peaks and correlated with the contribution from grain and grain boundary conductivities. The activation energies obtained for both grain and grain boundary conductivities confirm thermally activated hopping of oxygen. Theoretical analysis is carried out to estimate the grain boundary space charge potential at different temperatures for all compositions. The depletion of oxygen vacancies in the space charge layer is also determined. Despite the fact that Er is an isovalent dopant, both the space charge potential and oxygen vacancies are found to be composition dependent. The increase in space charge potential is related to decrease in grain boundary conductivity",
• keywords = "genetic algorithms, genetic programming, Oxide ion conductor, Impedance spectroscopy, Grain boundary, Space charge",

}

Genetic Programming entries for Tanmoy Paul Yoed Tsur

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