In:
Journal of the American Ceramic Society, Wiley, Vol. 97, No. 12 ( 2014-12), p. 4037-4044
Abstract:
Sr‐mayenite ( S 12 A 7 ) incorporating Cl − ions in its crystallographic cages up to the theoretical maximum occupancy, Sr 12 Al 14 O 32 Cl 2 , is reported in our study. The addition of a stoichiometric amount of SrCl 2 to the starting mixture is effective for the formation of Sr 12 Al 14 O 32 Cl 2 with high phase purity. Almost 100% densification is achieved using spark plasma sintering ( SPS ). Evaporation of SrCl 2 from Sr 12 Al 14 O 32 Cl 2 , which becomes significant at sintering temperatures above ~1300°C, degrades the phase purity. However, SrCl 2 effusion is significantly suppressed in the samples fully densified by SPS , impeding the decomposition of Sr 12 Al 14 O 32 Cl 2 up to temperature as high as ~1400°C. The crystal structure of Sr 12 Al 14 O 32 Cl 2 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 Sr 12 Al 14 O 32 Cl 2 exhibits humidity‐sensitive surface protonic conductivity. Dense Sr 12 Al 14 O 32 Cl 2 prepared under reducing conditions such as SPS exhibits electronic conductivity. Sr‐mayenite has various potential applications derived from its multifunctionalities.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.2014.97.issue-12
Language:
English
Publisher:
Wiley
Publication Date:
2014
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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