Chloride-ion-stabilized strontium mayenite: Expansion of versatile material family

Yingchao Dong, Katsuro Hayashi, Hiroki Nozoe, Yutaka Shinoda, Hideo Hosono

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Sr-mayenite (S12A7) incorporating Cl- ions in its crystallographic cages up to the theoretical maximum occupancy, Sr12Al14O32Cl2, is reported in our study. The addition of a stoichiometric amount of SrCl2 to the starting mixture is effective for the formation of Sr12Al14O32Cl2 with high phase purity. Almost 100% densification is achieved using spark plasma sintering (SPS). Evaporation of SrCl2 from Sr12Al14O32Cl2, which becomes significant at sintering temperatures above ∼1300°C, degrades the phase purity. However, SrCl2 effusion is significantly suppressed in the samples fully densified by SPS, impeding the decomposition of Sr12Al14O32Cl2 up to temperature as high as ∼1400°C. The crystal structure of Sr12Al14O32Cl2 was investigated by Rietveld analysis of the X-ray diffraction pattern. It is found that the Cl- ion is incorporated in the center of the inner cage with nearly theoretical maximum occupancy, which is responsible for the phase stability. Porous Sr12Al14O32Cl2 exhibits humidity-sensitive surface protonic conductivity. Dense Sr12Al14O32Cl2 prepared under reducing conditions such as SPS exhibits electronic conductivity. Sr-mayenite has various potential applications derived from its multifunctionalities.

Original languageEnglish
Pages (from-to)4037-4044
Number of pages8
JournalJournal of the American Ceramic Society
Volume97
Issue number12
DOIs
Publication statusPublished - Jan 1 2014

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Strontium
Spark plasma sintering
strontium
Chlorides
chloride
Ions
ion
plasma
Rietveld analysis
conductivity
Phase stability
Densification
Diffraction patterns
Atmospheric humidity
Evaporation
Sintering
Crystal structure
crystal structure
Decomposition
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Chloride-ion-stabilized strontium mayenite : Expansion of versatile material family. / Dong, Yingchao; Hayashi, Katsuro; Nozoe, Hiroki; Shinoda, Yutaka; Hosono, Hideo.

In: Journal of the American Ceramic Society, Vol. 97, No. 12, 01.01.2014, p. 4037-4044.

Research output: Contribution to journalArticle

Dong, Yingchao ; Hayashi, Katsuro ; Nozoe, Hiroki ; Shinoda, Yutaka ; Hosono, Hideo. / Chloride-ion-stabilized strontium mayenite : Expansion of versatile material family. In: Journal of the American Ceramic Society. 2014 ; Vol. 97, No. 12. pp. 4037-4044.
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