Solvated Electrons in High-Temperature Melts and Glasses of the Room-Temperature Stable Electride [Ca24Al28O64]4+⋅4e

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Science  01 Jul 2011:
Vol. 333, Issue 6038, pp. 71-74
DOI: 10.1126/science.1204394

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Solvated electrons in alkali metal-ammonia solutions have attracted attention as a prototype electronic conductor and chemical reducing agent for over a century. However, solvated electrons have not been realized in a high-temperature melt or glass of an oxide system to date. We demonstrated the formation of persistent solvated electrons in both a high-temperature melt and its glass by using the thermally stable electride [Ca24Al28O64]4+⋅4e (C12A7:e) and controlling the partial pressure of oxygen. The electrical and structural properties of the resulting melt and glass differ from those of the conventional C12A7:O2− oxide, exhibiting metallic and hopping conduction, respectively, and a glass transition temperature that is ~160 kelvin lower than that of C12A7:O2− glass. Solvated electrons reside in cage structures in C12A7:e and form a diamagnetic paired state.

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