Anomalous conductivity and microstructure in gadolinium doped ceria prepared from nano-sized powder

Natsuko Sakai; Yue Ping Xiong; Katsuhiko Yamaji; Harumi Yokokawa; Yoshitake Terashi; Hiroaki Seno

doi:10.1016/j.ssi.2006.03.049

Anomalous conductivity and microstructure in gadolinium doped ceria prepared from nano-sized powder

Natsuko Sakai^*
, Yue Ping Xiong
, Katsuhiko Yamaji
, Harumi Yokokawa
, Yoshitake Terashi
, Hiroaki Seno

^*Corresponding author for this work

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

17 Scopus citations

Abstract

The temperature and the oxygen partial pressure dependences of the electron and hole conductivities were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell for Gd_0.2Ce_0.8O_1.9 polycrystalline bodies with grain size of 0.5 μm prepared by sintering of nano-sized powder. A significant enrichment of gadolinium was observed in the vicinity of the grain boundary by TEM/EDS analyses. The electron conductivity were comparable with those of conventional Gd_0.2Ce_0.8O_1.9 polycrystalline body with grain size of 2 μm, and it followed p(O₂)^{- 1/4} dependence at temperatures T = 973-1273 K. However, the observed hole conductivity was higher than that of conventional Gd_0.2Ce_0.8O_1.9, and it did not follow p(O₂)^1/4 dependence. This anomalous p(O₂) dependence disappeared after the sample was treated at T = 1773 K for 38 h and grain size was enlarged to 2-10 μm.

Original language	English
Pages (from-to)	2503-2507
Number of pages	5
Journal	Solid State Ionics
Volume	177
Issue number	26-32 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.ssi.2006.03.049
State	Published - 31 Oct 2006
Externally published	Yes

Keywords

Ceria
Conductivity
Electron
Grain boundary
Hole
Ion blocking

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10.1016/j.ssi.2006.03.049

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title = "Anomalous conductivity and microstructure in gadolinium doped ceria prepared from nano-sized powder",

abstract = "The temperature and the oxygen partial pressure dependences of the electron and hole conductivities were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell for Gd0.2Ce0.8O1.9 polycrystalline bodies with grain size of 0.5 μm prepared by sintering of nano-sized powder. A significant enrichment of gadolinium was observed in the vicinity of the grain boundary by TEM/EDS analyses. The electron conductivity were comparable with those of conventional Gd0.2Ce0.8O1.9 polycrystalline body with grain size of 2 μm, and it followed p(O2)- 1/4 dependence at temperatures T = 973-1273 K. However, the observed hole conductivity was higher than that of conventional Gd0.2Ce0.8O1.9, and it did not follow p(O2)1/4 dependence. This anomalous p(O2) dependence disappeared after the sample was treated at T = 1773 K for 38 h and grain size was enlarged to 2-10 μm.",

keywords = "Ceria, Conductivity, Electron, Grain boundary, Hole, Ion blocking",

author = "Natsuko Sakai and Xiong, \{Yue Ping\} and Katsuhiko Yamaji and Harumi Yokokawa and Yoshitake Terashi and Hiroaki Seno",

year = "2006",

month = oct,

day = "31",

doi = "10.1016/j.ssi.2006.03.049",

language = "英语",

volume = "177",

pages = "2503--2507",

journal = "Solid State Ionics",

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TY - JOUR

T1 - Anomalous conductivity and microstructure in gadolinium doped ceria prepared from nano-sized powder

AU - Sakai, Natsuko

AU - Xiong, Yue Ping

AU - Yamaji, Katsuhiko

AU - Yokokawa, Harumi

AU - Terashi, Yoshitake

AU - Seno, Hiroaki

PY - 2006/10/31

Y1 - 2006/10/31

N2 - The temperature and the oxygen partial pressure dependences of the electron and hole conductivities were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell for Gd0.2Ce0.8O1.9 polycrystalline bodies with grain size of 0.5 μm prepared by sintering of nano-sized powder. A significant enrichment of gadolinium was observed in the vicinity of the grain boundary by TEM/EDS analyses. The electron conductivity were comparable with those of conventional Gd0.2Ce0.8O1.9 polycrystalline body with grain size of 2 μm, and it followed p(O2)- 1/4 dependence at temperatures T = 973-1273 K. However, the observed hole conductivity was higher than that of conventional Gd0.2Ce0.8O1.9, and it did not follow p(O2)1/4 dependence. This anomalous p(O2) dependence disappeared after the sample was treated at T = 1773 K for 38 h and grain size was enlarged to 2-10 μm.

AB - The temperature and the oxygen partial pressure dependences of the electron and hole conductivities were measured by the dc polarization method using a Hebb-Wagner's ion blocking cell for Gd0.2Ce0.8O1.9 polycrystalline bodies with grain size of 0.5 μm prepared by sintering of nano-sized powder. A significant enrichment of gadolinium was observed in the vicinity of the grain boundary by TEM/EDS analyses. The electron conductivity were comparable with those of conventional Gd0.2Ce0.8O1.9 polycrystalline body with grain size of 2 μm, and it followed p(O2)- 1/4 dependence at temperatures T = 973-1273 K. However, the observed hole conductivity was higher than that of conventional Gd0.2Ce0.8O1.9, and it did not follow p(O2)1/4 dependence. This anomalous p(O2) dependence disappeared after the sample was treated at T = 1773 K for 38 h and grain size was enlarged to 2-10 μm.

KW - Ceria

KW - Conductivity

KW - Electron

KW - Grain boundary

KW - Hole

KW - Ion blocking

UR - https://www.scopus.com/pages/publications/33750345424

U2 - 10.1016/j.ssi.2006.03.049

DO - 10.1016/j.ssi.2006.03.049

M3 - 文章

AN - SCOPUS:33750345424

SN - 0167-2738

VL - 177

SP - 2503

EP - 2507

JO - Solid State Ionics

JF - Solid State Ionics

IS - 26-32 SPEC. ISS.

ER -

Anomalous conductivity and microstructure in gadolinium doped ceria prepared from nano-sized powder

Abstract

Keywords

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