Ionic conductivity and relaxations of In-doped GDC (gadolinium doped ceria) ceramics

Ho Chang Lee; Jung A. Lee; Joon Hyung Lee; Young Woo Heo; Jeong Joo Kim

doi:10.1016/j.ceramint.2017.06.018

Ionic conductivity and relaxations of In-doped GDC (gadolinium doped ceria) ceramics

Ho Chang Lee, Jung A. Lee, Joon Hyung Lee, Young Woo Heo, Jeong Joo Kim

Kyungpook National University

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The effect of In doping on the sintering behaviors and electrical properties of Gd_0.1Ce_0.9O_1.95 (Gd-doped ceria, or GDC) was investigated. The solubility limit of In in GDC was determined to be ~2 at%, and the lattice parameter of GDC was found to decrease from 5.417(7) Å to 5.416(5) Å with 2 at% In dopant. The mean grain size of the sintered body decreased with increasing In content. The concentration of In did not significantly affect the conductivity of the samples; however, undoped GDC showed the highest conductivity. Cole-Cole plots showed that the activation energies of the grain boundaries and grain interiors decreased and increased, respectively, as the In concentration increased to 1 at%. The decreased grain-boundary activation energy is attributed to the segregation of the negatively charged dopant at the grain boundaries, while the increased activation energy of the grain interiors is attributed to the decreases in both the lattice parameters and binding energies with In doping.

Original language	English
Pages (from-to)	11792-11798
Number of pages	7
Journal	Ceramics International
Volume	43
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2017.06.018
State	Published - 15 Oct 2017

Keywords

GDC
Impedance spectroscopy
Solid oxide fuel cell

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10.1016/j.ceramint.2017.06.018

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@article{a732d8d738694f8290b9ab0abfc0d91e,

title = "Ionic conductivity and relaxations of In-doped GDC (gadolinium doped ceria) ceramics",

abstract = "The effect of In doping on the sintering behaviors and electrical properties of Gd0.1Ce0.9O1.95 (Gd-doped ceria, or GDC) was investigated. The solubility limit of In in GDC was determined to be ~2 at%, and the lattice parameter of GDC was found to decrease from 5.417(7) {\AA} to 5.416(5) {\AA} with 2 at% In dopant. The mean grain size of the sintered body decreased with increasing In content. The concentration of In did not significantly affect the conductivity of the samples; however, undoped GDC showed the highest conductivity. Cole-Cole plots showed that the activation energies of the grain boundaries and grain interiors decreased and increased, respectively, as the In concentration increased to 1 at%. The decreased grain-boundary activation energy is attributed to the segregation of the negatively charged dopant at the grain boundaries, while the increased activation energy of the grain interiors is attributed to the decreases in both the lattice parameters and binding energies with In doping.",

keywords = "GDC, Impedance spectroscopy, Solid oxide fuel cell",

author = "Lee, {Ho Chang} and Lee, {Jung A.} and Lee, {Joon Hyung} and Heo, {Young Woo} and Kim, {Jeong Joo}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

year = "2017",

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doi = "10.1016/j.ceramint.2017.06.018",

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T1 - Ionic conductivity and relaxations of In-doped GDC (gadolinium doped ceria) ceramics

AU - Lee, Ho Chang

AU - Lee, Jung A.

AU - Lee, Joon Hyung

AU - Heo, Young Woo

AU - Kim, Jeong Joo

PY - 2017/10/15

Y1 - 2017/10/15

N2 - The effect of In doping on the sintering behaviors and electrical properties of Gd0.1Ce0.9O1.95 (Gd-doped ceria, or GDC) was investigated. The solubility limit of In in GDC was determined to be ~2 at%, and the lattice parameter of GDC was found to decrease from 5.417(7) Å to 5.416(5) Å with 2 at% In dopant. The mean grain size of the sintered body decreased with increasing In content. The concentration of In did not significantly affect the conductivity of the samples; however, undoped GDC showed the highest conductivity. Cole-Cole plots showed that the activation energies of the grain boundaries and grain interiors decreased and increased, respectively, as the In concentration increased to 1 at%. The decreased grain-boundary activation energy is attributed to the segregation of the negatively charged dopant at the grain boundaries, while the increased activation energy of the grain interiors is attributed to the decreases in both the lattice parameters and binding energies with In doping.

AB - The effect of In doping on the sintering behaviors and electrical properties of Gd0.1Ce0.9O1.95 (Gd-doped ceria, or GDC) was investigated. The solubility limit of In in GDC was determined to be ~2 at%, and the lattice parameter of GDC was found to decrease from 5.417(7) Å to 5.416(5) Å with 2 at% In dopant. The mean grain size of the sintered body decreased with increasing In content. The concentration of In did not significantly affect the conductivity of the samples; however, undoped GDC showed the highest conductivity. Cole-Cole plots showed that the activation energies of the grain boundaries and grain interiors decreased and increased, respectively, as the In concentration increased to 1 at%. The decreased grain-boundary activation energy is attributed to the segregation of the negatively charged dopant at the grain boundaries, while the increased activation energy of the grain interiors is attributed to the decreases in both the lattice parameters and binding energies with In doping.

KW - GDC

KW - Impedance spectroscopy

KW - Solid oxide fuel cell

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DO - 10.1016/j.ceramint.2017.06.018

M3 - Article

AN - SCOPUS:85020455820

SN - 0272-8842

VL - 43

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EP - 11798

JO - Ceramics International

JF - Ceramics International

IS - 15

ER -

Ionic conductivity and relaxations of In-doped GDC (gadolinium doped ceria) ceramics

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Keywords

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