Ionic Transport Properties in Nanocrystalline Ce0.8A0.2O2-δ (with A = Eu, Gd, Dy, and Ho) Materials

Autor: V. Sankaranarayanan, Ashok Kumar Baral
Rok vydání: 2010
Předmět:
Cerium compounds
Analytical chemistry
Dielectric relaxation
Ionic bonding
Gadolinium
Conductivity
Holmium
Nanotechnology
General Materials Science
Doped ceria
Nano Express
Lattice constants
Materials Science
general
Cerium
Condensed Matter Physics
Grain size
Nanocrystalline material
Physics
General
Oxygen vacancies
Dielectric properties
Dynamic parameters
Transport properties
Nano-materials
Molecular Medicine
Grain boundary
Association energies
Materials science
Dielectric
Ionic transports
Grain boundary conductivity
Europium
Ionic conduction
Materials Science(all)
Doping (additives)
Chemistry/Food Science
general
Nanocrystallines
Material Science
Dopant
Engineering
General
Dielectric relaxations
Doping
Average grain size
Association energy
Lattice parameters
Grain interiors
Nanostructures
Oxygen
Electrical transport
Grain boundaries
Dielectric constants
Grain size and shape
Zdroj: Nanoscale Research Letters
ISSN: 1556-276X
1931-7573
DOI: 10.1007/s11671-010-9527-z
Popis: The ionic transport properties of nanocrystalline 20 mol% Eu, Gd, Dy, and Ho doped cerias, with average grain size of around 14 nm were studied by correlating electrical, dielectric properties, and various dynamic parameters. Gd-doped nanocrystalline ceria shows higher value of conductivity (i. e., 1. 8 � 10 -4 S cm -1 at 550�C) and a lower value of association energy of oxygen vacancies with trivalent dopants Gd 3+ (i. e., 0. 1 eV), compared to others. Mainly the lattice parameters and dielectric constants (? ?) are found to control the association energy of oxygen vacancies in these nanomaterials, which in turn resulted in the presence of grain and grain boundary conductivity in Gd- and Eu-doped cerias and only significant grain interior conductivity in Dy- and Ho-doped cerias. � The Author(s) 2010.
Databáze: OpenAIRE
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