Absolute emission current density of O− from 12CaO⋅7Al2O3 crystal

Li, Q. X.; Hayashi, Katsuro; Nishioka, Makihito; Kashiwagi, H.; Hirano, Masahiro; Torimoto, Youshifumi; Hosono, Hideo; Sadakata, Masayoshi

doi:10.1063/1.1476958

Cited by 88 publications

(96 citation statements)

References 21 publications

(13 reference statements)

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“…Nearly pure O À ion emission from the surface was confirmed by mass spectroscopy. [30][31][32][33] This result is in clear contrast from the YSZ, which emits equimolar O À ions and electrons. When the sample was heated to %800 C and the applied field was increased to %1 kV cm À1 , the O À current density exceeded %1 mA cm À2 , which is three orders of magnitude higher than that obtained in the YSZ emitter.…”

Section: Formation In Cagesmentioning

confidence: 45%

Functionalities of a Nanoporous Crystal 12CaO·7Al2O3 Originating from the Incorporation of Active Anions

Hayashi¹,

Hirano²,

Hosono³

2007

Bulletin of the Chemical Society of Japan

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A cage structure formed in a positively charged lattice framework of 12CaO Á 7Al 2 O 3 (C12A7) is utilized to incorporate and release chemically unstable anions, imparting chemical and electronic activities to this material. High concentrations of oxygen radical anions, i.e. O À and O 2 À , are formed efficiently in these cages under a high oxygen activity condition. The O À ion, which is the strongest oxidant among all the reactive oxygen species, can be extracted from the cages into an external vacuum by applying an electric field with thermal assistance. In contrast, hydrogen-reduction processes allow the formation of hydride (H À ) ions in the cage. H À ion-incorporated C12A7 exhibits a persistent insulator-conductor conversion upon irradiation with ultraviolet-light or electron-beam. The irradiation-induced conversion mechanism and electronic transport characteristics are discussed on the basis of experimental evidence and first-principle theoretical calculations. Electrons released from the H À ions are trapped by the cages and subsequent inter-cage hopping of the electrons is responsible for the electrical conduction. Furthermore, a severe reducing environment enables us to substitute electrons almost completely for anions in the cages, forming a stable inorganic electride. Finally, the formation of these active anions in this material is examined in terms of electronic structures, thermodynamics, and structural features of the cage.

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Section: Formation In Cagesmentioning

confidence: 45%

Functionalities of a Nanoporous Crystal 12CaO·7Al2O3 Originating from the Incorporation of Active Anions

Hayashi¹,

Hirano²,

Hosono³

2007

Bulletin of the Chemical Society of Japan

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“…Such emission shows a maximum current density of 2.74 (μAcm -2 ) which is three times higher than the maximum value recorded for the conventional Y-stabilised ZrO2 (YSZ) [48].…”

Section: Oˉ Ion Emittermentioning

confidence: 90%

“…There is a strong correlation between the Oˉ ion emissions from C12A7: Oˉ + O2ˉ and the surface temperature as well as the applied extraction field [25], [44], [48]. A Complete discussion of this subject is not considered in this work.…”

Section: Oˉ Ion Emittermentioning

confidence: 99%

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Novel Binary Calcia–Alumina Systems for Device Applications

Zahedi¹

2009

sci adv mat

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“…The emission intensity increases with either parameter. The average activation energy was 0.7 eV, which is considerably smaller than that observed for thermal O − ion (∼ 2.0−2.5 eV) [50][51][52][53][54][55] and electron emissions (∼ 6 eV) [56] from zirconia.…”

Section: Atomic Oxygen Emission From Zirconiamentioning

confidence: 98%

New functionalities in abundant element oxides: ubiquitous element strategy

Hosono

Hayashi

Kamiya

et al. 2011

Science and Technology of Advanced Materials

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While most ceramics are composed of ubiquitous elements (the ten most abundant elements within the Earth's crust), many advanced materials are based on rare elements. A 'rare-element crisis' is approaching owing to the imbalance between the limited supply of rare elements and the increasing demand. Therefore, we propose a 'ubiquitous element strategy' for materials research, which aims to apply abundant elements in a variety of innovative applications. Creation of innovative oxide materials and devices based on conventional ceramics is one specific challenge. This review describes the concept of ubiquitous element strategy and gives some highlights of our recent research on the synthesis of electronic, thermionic and structural materials using ubiquitous elements.

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Absolute emission current density of O− from 12CaO⋅7Al2O3 crystal

Cited by 88 publications

References 21 publications

Functionalities of a Nanoporous Crystal 12CaO·7Al2O3 Originating from the Incorporation of Active Anions

Functionalities of a Nanoporous Crystal 12CaO·7Al2O3 Originating from the Incorporation of Active Anions

Novel Binary Calcia–Alumina Systems for Device Applications

New functionalities in abundant element oxides: ubiquitous element strategy

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