Ionic Transport Properties in Nanocrystalline Ce<sub>0.8</sub>A<sub>0.2</sub>O<sub>2-δ</sub> (with A = Eu, Gd, Dy, and Ho) Materials
<p>Abstract</p> <p>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...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2010-01-01
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| Series: | Nanoscale Research Letters |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1007/s11671-010-9527-z |
| Summary: | <p>Abstract</p> <p>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<sup>−4</sup> S cm<sup>−1</sup> at 550°C) and a lower value of association energy of oxygen vacancies with trivalent dopants Gd<sup>3+</sup> (i.e., 0.1 eV), compared to others. Mainly the lattice parameters and dielectric constants (ε<sub>∞</sub>) 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.</p> |
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| ISSN: | 1931-7573 1556-276X |