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Crystals 2017, 7(5), 143; doi:10.3390/cryst7050143

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
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Academic Editor: Helmut Cölfen
Received: 20 March 2017 / Revised: 8 May 2017 / Accepted: 10 May 2017 / Published: 16 May 2017
(This article belongs to the Special Issue Crystallography of Functional Materials)
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Abstract

Ca12Al14O33 (C12A7, 12CaO·7Al2O3, or [ Ca 12 Al 14 O 32 ] 2 + : O 2 ) is a material with a clathrate cage framework, positively charged and stabilized by anions occluded within 17% of the cages. The occluded anion is modular and can be elemental, polyatomic, and electronic in nature. This review focuses on the electride C12A7 ( [ Ca 24 Al 28 O 64 ] 4 + : ( 4 * ) e ( 2 ) O 2 ), where O2− anions are replaced with electrons, and compliments previous structural and electronic property reviews to illuminate the structure–property relationships. Electride formation is updated with new findings in carbonaceous reduction methods. Most importantly, an extensive compilation of cationic doped C12A7 isostructural compounds is presented as motivation to study doped C12A7 electrides. Cationic dopants have profound impacts on the electronic properties due to changes in the density of states, localized electron behavior, and structural distortions. View Full-Text
Keywords: electride; mayenite; Ca12Al14O33; lime-alumina compound; cationic doping; structure–property relationships; 12CaO·7Al2O3; C12A7 electride; mayenite; Ca12Al14O33; lime-alumina compound; cationic doping; structure–property relationships; 12CaO·7Al2O3; C12A7
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Salasin, J.R.; Rawn, C. Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review. Crystals 2017, 7, 143.

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