High-density electron anions in a nanoporous single crystal: [Ca24Al28O64]4+ (4e-)

Satoru Matsuishi, Yoshitake Toda, Masashi Miyakawa, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Isao Tanaka, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

682 Citations (Scopus)


We removed ∼100% of clathrated oxygen ions from the crystallographic cages in a single crystal of 12CaO·7Al2O3, leading to the formation of high-density (∼2 x 1021 cm-3) electrons highly localized in the cages. The resulting electron forms a structure that we interpret as an F+ center and migrates throughout the crystal by hopping to a neighboring cage with conductivity ∼100 siemens per centimeter, demonstrating that the encaged electron behaves as an anion. The electron anions couple antiferromagnetically with each other, forming a diamagnetic pair or singlet bipolaron. The resulting [Ca24Al28O64]4+(4e-) may be regarded as a thermally and chemically stable single crystalline "electride".

Original languageEnglish
Pages (from-to)626-629
Number of pages4
Issue number5633
Publication statusPublished - Aug 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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