Emission characteristics of negative oxygen ions into vacuum from cerium oxide

Takaaki Sakai; Yukio Fujiwara; Atsushi Kaimai; Keiji Yashiro; Hiroshige Matsumoto; Yutaka Nigara; Tatsuya Kawada; Junichiro Mizusaki

doi:10.1016/j.jallcom.2004.12.125

Emission characteristics of negative oxygen ions into vacuum from cerium oxide

Takaaki Sakai, Yukio Fujiwara, Atsushi Kaimai, Keiji Yashiro, Hiroshige Matsumoto, Yutaka Nigara, Tatsuya Kawada, Junichiro Mizusaki

ENV - Environmental Studies for Advanced Society

Research output: Contribution to journal › Conference article › peer-review

8 Citations (Scopus)

Abstract

The oxygen ion emission characteristics of CeO₂ were studied under electric field in a vacuum chamber to find a candidate material for a novel ion source, "solid oxide ion source (SOIS)". The emission current was observed from CeO₂ under a pressure of around 10 ^-3 Pa, at the temperature ranging from 973 K to 1173 K. It was found that the emission current increased with temperature and applied voltage. The ions emitted from CeO₂ were confirmed to be oxygen negative ions (O^-) by the use of quadrupole mass spectrometer. The emission current decreased with time as was observed in the earlier works with other oxide ion conductors such as stabilized zirconia [1,2] or other materials [3]. To enhance the emission current from CeO₂, an introduction of donor into CeO₂ was tested using Ce_0.992Nb_0.008O ₂. For comparison, effect of acceptor doping was also tested using Ce_0.9Gd_0.1O_1.95. The emission current from Ce_0.9Gd_0.1O_1.95 was smaller than that from donor-doped and pure CeO_2. Clear enhancement of the emission current was not observed with Ce_0.992Nb_0.008O₂.

Original language	English
Pages (from-to)	1127-1131
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	408-412
DOIs	https://doi.org/10.1016/j.jallcom.2004.12.125
Publication status	Published - 2006 Feb 9
Event	Proceedings of the Rare Earths'04 in Nara, Japan - Duration: 2004 Nov 7 → 2004 Nov 12

Keywords

CeO
Ionic conduction
Surface and interface
Thermionic emission

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2004.12.125

Cite this

@article{e02c6a43f27b4a3d9e99ffd60f047f66,

title = "Emission characteristics of negative oxygen ions into vacuum from cerium oxide",

abstract = "The oxygen ion emission characteristics of CeO2 were studied under electric field in a vacuum chamber to find a candidate material for a novel ion source, {"}solid oxide ion source (SOIS){"}. The emission current was observed from CeO2 under a pressure of around 10 -3 Pa, at the temperature ranging from 973 K to 1173 K. It was found that the emission current increased with temperature and applied voltage. The ions emitted from CeO2 were confirmed to be oxygen negative ions (O-) by the use of quadrupole mass spectrometer. The emission current decreased with time as was observed in the earlier works with other oxide ion conductors such as stabilized zirconia [1,2] or other materials [3]. To enhance the emission current from CeO2, an introduction of donor into CeO2 was tested using Ce0.992Nb0.008O 2. For comparison, effect of acceptor doping was also tested using Ce0.9Gd0.1O1.95. The emission current from Ce0.9Gd0.1O1.95 was smaller than that from donor-doped and pure CeO2. Clear enhancement of the emission current was not observed with Ce0.992Nb0.008O2.",

keywords = "CeO, Ionic conduction, Surface and interface, Thermionic emission",

author = "Takaaki Sakai and Yukio Fujiwara and Atsushi Kaimai and Keiji Yashiro and Hiroshige Matsumoto and Yutaka Nigara and Tatsuya Kawada and Junichiro Mizusaki",

year = "2006",

month = feb,

day = "9",

doi = "10.1016/j.jallcom.2004.12.125",

language = "English",

volume = "408-412",

pages = "1127--1131",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

note = "Proceedings of the Rare Earths'04 in Nara, Japan ; Conference date: 07-11-2004 Through 12-11-2004",

}

TY - JOUR

T1 - Emission characteristics of negative oxygen ions into vacuum from cerium oxide

AU - Sakai, Takaaki

AU - Fujiwara, Yukio

AU - Kaimai, Atsushi

AU - Yashiro, Keiji

AU - Matsumoto, Hiroshige

AU - Nigara, Yutaka

AU - Kawada, Tatsuya

AU - Mizusaki, Junichiro

PY - 2006/2/9

Y1 - 2006/2/9

N2 - The oxygen ion emission characteristics of CeO2 were studied under electric field in a vacuum chamber to find a candidate material for a novel ion source, "solid oxide ion source (SOIS)". The emission current was observed from CeO2 under a pressure of around 10 -3 Pa, at the temperature ranging from 973 K to 1173 K. It was found that the emission current increased with temperature and applied voltage. The ions emitted from CeO2 were confirmed to be oxygen negative ions (O-) by the use of quadrupole mass spectrometer. The emission current decreased with time as was observed in the earlier works with other oxide ion conductors such as stabilized zirconia [1,2] or other materials [3]. To enhance the emission current from CeO2, an introduction of donor into CeO2 was tested using Ce0.992Nb0.008O 2. For comparison, effect of acceptor doping was also tested using Ce0.9Gd0.1O1.95. The emission current from Ce0.9Gd0.1O1.95 was smaller than that from donor-doped and pure CeO2. Clear enhancement of the emission current was not observed with Ce0.992Nb0.008O2.

AB - The oxygen ion emission characteristics of CeO2 were studied under electric field in a vacuum chamber to find a candidate material for a novel ion source, "solid oxide ion source (SOIS)". The emission current was observed from CeO2 under a pressure of around 10 -3 Pa, at the temperature ranging from 973 K to 1173 K. It was found that the emission current increased with temperature and applied voltage. The ions emitted from CeO2 were confirmed to be oxygen negative ions (O-) by the use of quadrupole mass spectrometer. The emission current decreased with time as was observed in the earlier works with other oxide ion conductors such as stabilized zirconia [1,2] or other materials [3]. To enhance the emission current from CeO2, an introduction of donor into CeO2 was tested using Ce0.992Nb0.008O 2. For comparison, effect of acceptor doping was also tested using Ce0.9Gd0.1O1.95. The emission current from Ce0.9Gd0.1O1.95 was smaller than that from donor-doped and pure CeO2. Clear enhancement of the emission current was not observed with Ce0.992Nb0.008O2.

KW - CeO

KW - Ionic conduction

KW - Surface and interface

KW - Thermionic emission

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DO - 10.1016/j.jallcom.2004.12.125

M3 - Conference article

AN - SCOPUS:31344439288

SN - 0925-8388

VL - 408-412

SP - 1127

EP - 1131

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

T2 - Proceedings of the Rare Earths'04 in Nara, Japan

Y2 - 7 November 2004 through 12 November 2004

ER -

Emission characteristics of negative oxygen ions into vacuum from cerium oxide

Abstract

Keywords

ASJC Scopus subject areas

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