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Ion transport and dielectric relaxation studies in nanocrystalline Ce0.8Ho0.2O2-δ material
Published in
2009
Volume: 404
   
Issue: 12-13
Pages: 1674 - 1678
Abstract
The ac electrical conductivity and dielectric relaxation properties of nanocrystalline 20 mol% Ho doped ceria (Ce0.8Ho0.2O2-δ) prepared by citrate auto ignition method, were studied in the temperature range 300-550 °C. The conductivity behaviour showed the absence of any precipitation of Ho inside the grains, even though it has the tendency of forming a C-type structure similar to Ho2O3 in association with oxygen vacancies. The frequency spectra of electric modulus M″ exhibits a single relaxation peak corresponding to relaxation reorientation of oxygen vacancy around the Ho+3 ions in the cubic nanostructured material. The migration of oxygen ions in the nanocrystalline Ce0.8Ho0.2O2-δ material takes place through hopping and the migration energy and association energy of oxygen vacancies in the long range order motion are found to be 1.02 and 0.24 eV, respectively. © 2009 Elsevier B.V. All rights reserved.
About the journal
JournalPhysica B: Condensed Matter
ISSN09214526
Open AccessNo
Concepts (25)
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    AC ELECTRICAL CONDUCTIVITIES
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    ASSOCIATION ENERGIES
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    AUTO IGNITIONS
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    C-TYPE STRUCTURES
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    Electric modulus
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    FREQUENCY SPECTRUMS
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    ION TRANSPORTS
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    Long range orders
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    MIGRATION ENERGY
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    NANOCRYSTALLINE HO DOPED CERIA
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    Oxygen ions
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    SINGLE RELAXATIONS
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    STRUCTURAL INHOMOGENEITY
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    Temperature ranges
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    Cerium
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    CERIUM COMPOUNDS
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    Dielectric relaxation
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    Electric conductivity
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    Holmium
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    Ions
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    Nanocrystalline materials
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    Nanostructured materials
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    Oxygen
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    Vacancies
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    Oxygen vacancies