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,
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author = "Tanmoy Paul and Yoed Tsur",
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title = "Effect of isovalent doping on grain boundary
conductivity for La2Mo2O9 oxide ion conductor: A
distribution function of relaxation times approach",
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journal = "Solid State Ionics",
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volume = "323",
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pages = "37--43",
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year = "2018",
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keywords = "genetic algorithms, genetic programming, Oxide ion
conductor, Impedance spectroscopy, Grain boundary,
Space charge",
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ISSN = "0167-2738",
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DOI = "doi:10.1016/j.ssi.2018.05.011",
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URL = "http://www.sciencedirect.com/science/article/pii/S0167273817307348",
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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",
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keywords = "genetic algorithms, genetic programming, Oxide ion
conductor, Impedance spectroscopy, Grain boundary,
Space charge",
- }
Genetic Programming entries for
Tanmoy Paul
Yoed Tsur
Citations