Direct synthesis of powdery inorganic electride [Ca24Al 28O64]4+ (e-)4 and determination of oxygen stoichiometry

Satoru Matsuishi; Takatoshi Nomura; Masahiro Hirano; Katsuaki Kodama; Shin ichi Shamoto; Hideo Hosono

doi:10.1021/cm9007987

Direct synthesis of powdery inorganic electride [Ca₂₄Al ₂₈O₆₄]⁴⁺ (e^-)₄ and determination of oxygen stoichiometry

Satoru Matsuishi, Takatoshi Nomura, Masahiro Hirano, Katsuaki Kodama, Shin ichi Shamoto, Hideo Hosono

Department of Physics

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

64 Citations (Scopus)

Abstract

A direct synthesis method for the preparation of the Ca₁₂A ₁₄O₃₃ crystal (C12A7) electride powder with the electron density up to 2.33 × 10²¹ cm^-3 is reported. The crystals were synthesized by a reaction of C12A7, CaO· Al ₂O₃ (CA), and a metal at 700-1100°C. Rietved refinement using program TOPAS3 reveal that the calculated pattern for C12A7 framework structure without the free oxygen ions is well-fitted to the observed pattern. Additional weight loss observed above 775°C and integrated net weight gain from 300 to 1350°C is determined to be 1.20%, which is close to the theoretical one due to the oxidation of C12A7 electride to form stoichiometric C12A7. Absorption spectra of C12A7 powders show that the absorption band is centered at 2-4 eV and is associated with s-p transition of the electron bound to the cage.

Original language	English
Pages (from-to)	2589-2591
Number of pages	3
Journal	Chemistry of Materials
Volume	21
Issue number	13
DOIs	https://doi.org/10.1021/cm9007987
Publication status	Published - 2009 Jul 14

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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@article{39cc18730af542beb7630d3c73bb65c5,

title = "Direct synthesis of powdery inorganic electride [Ca24Al 28O64]4+ (e-)4 and determination of oxygen stoichiometry",

abstract = "A direct synthesis method for the preparation of the Ca12A 14O33 crystal (C12A7) electride powder with the electron density up to 2.33 × 1021 cm-3 is reported. The crystals were synthesized by a reaction of C12A7, CaO· Al 2O3 (CA), and a metal at 700-1100°C. Rietved refinement using program TOPAS3 reveal that the calculated pattern for C12A7 framework structure without the free oxygen ions is well-fitted to the observed pattern. Additional weight loss observed above 775°C and integrated net weight gain from 300 to 1350°C is determined to be 1.20%, which is close to the theoretical one due to the oxidation of C12A7 electride to form stoichiometric C12A7. Absorption spectra of C12A7 powders show that the absorption band is centered at 2-4 eV and is associated with s-p transition of the electron bound to the cage.",

author = "Satoru Matsuishi and Takatoshi Nomura and Masahiro Hirano and Katsuaki Kodama and Shamoto, {Shin ichi} and Hideo Hosono",

year = "2009",

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doi = "10.1021/cm9007987",

language = "English",

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journal = "Chemistry of Materials",

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T1 - Direct synthesis of powdery inorganic electride [Ca24Al 28O64]4+ (e-)4 and determination of oxygen stoichiometry

AU - Matsuishi, Satoru

AU - Nomura, Takatoshi

AU - Hirano, Masahiro

AU - Kodama, Katsuaki

AU - Shamoto, Shin ichi

AU - Hosono, Hideo

PY - 2009/7/14

Y1 - 2009/7/14

N2 - A direct synthesis method for the preparation of the Ca12A 14O33 crystal (C12A7) electride powder with the electron density up to 2.33 × 1021 cm-3 is reported. The crystals were synthesized by a reaction of C12A7, CaO· Al 2O3 (CA), and a metal at 700-1100°C. Rietved refinement using program TOPAS3 reveal that the calculated pattern for C12A7 framework structure without the free oxygen ions is well-fitted to the observed pattern. Additional weight loss observed above 775°C and integrated net weight gain from 300 to 1350°C is determined to be 1.20%, which is close to the theoretical one due to the oxidation of C12A7 electride to form stoichiometric C12A7. Absorption spectra of C12A7 powders show that the absorption band is centered at 2-4 eV and is associated with s-p transition of the electron bound to the cage.

AB - A direct synthesis method for the preparation of the Ca12A 14O33 crystal (C12A7) electride powder with the electron density up to 2.33 × 1021 cm-3 is reported. The crystals were synthesized by a reaction of C12A7, CaO· Al 2O3 (CA), and a metal at 700-1100°C. Rietved refinement using program TOPAS3 reveal that the calculated pattern for C12A7 framework structure without the free oxygen ions is well-fitted to the observed pattern. Additional weight loss observed above 775°C and integrated net weight gain from 300 to 1350°C is determined to be 1.20%, which is close to the theoretical one due to the oxidation of C12A7 electride to form stoichiometric C12A7. Absorption spectra of C12A7 powders show that the absorption band is centered at 2-4 eV and is associated with s-p transition of the electron bound to the cage.

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ER -

Direct synthesis of powdery inorganic electride [Ca₂₄Al ₂₈O₆₄]⁴⁺ (e^-)₄ and determination of oxygen stoichiometry

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