Novel Room Temperature Stable Electride 12SrO7Al sub(2)O sub(3) Thin Films: Fabrication, Optical and Electron Transport Properties

12SrO7Al sub(2)O sub(3) (S12A7) is a meta-stable phase in the system of SrO-Al sub(2)O sub(3) and has the isostructure with 12CaO7Al sub(2)O sub(3) (C12A7), which is composed of sub-nanometer-sized cages with oxygen ions loosely encaged in the cages. This letter reports fabrication of polycrystallin...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2007-01, Vol.115 (1345), p.567-570
Main Authors: Miyakawa, Masashi, Ueda, Naoto, Kamiya, Toshio, Hirano, Masahiro, Hosono, Hideo
Format: Article
Language:English
Subjects:
Cages
Conductivity
Electronics
Nanocomposites
Nanomaterials
Nanostructure
Resistivity
Thin films
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Summary:12SrO7Al sub(2)O sub(3) (S12A7) is a meta-stable phase in the system of SrO-Al sub(2)O sub(3) and has the isostructure with 12CaO7Al sub(2)O sub(3) (C12A7), which is composed of sub-nanometer-sized cages with oxygen ions loosely encaged in the cages. This letter reports fabrication of polycrystalline thin films of insulating and metallic S12A7 electride thin films. The as-crystallized film was an electrical insulator, while light-induced persistent electronic conduction with a conductivity of~1x10 super(-3) Scm super(-1) at 300 K was realized in proton-implanted films. Higher conductivities of~270 Scm super(-1) were attained in the films subjected to a reduction treatment using an oxygen deficient amorphous film deposition. These behaviors are similar to those observed on C12A7. The present results suggest that S12A7 is another candidate material to explore electronic functions originating from a nanoporous structure embedded in a crystal structure.
ISSN:1348-6535