遷移金属カチオンを用いたイオン交換によるNaCo_2O_4のサイト選択元素置換

Translated title of the contribution: Site-Selective Substitution by Transition Metal Cations for NaCo_2O_4 via Ion-Exchange

Yoshihiro Nojiri, Michitaka Ohtaki

    Research output: Contribution to journalArticle

    Abstract

    Incorporation of Ni ions into two different sites of the Na and Co sites of NaCo_2O_4 was carried out by the processes of conventional elemental substitution for Co ion and solid state ion exchange of mobile Na^+ ion. The changes of the lattice parameters of "substituted" and "exchanged" samples were different, suggesting that the Ni ions occupy different sites. The Ni-substituted sample for Co showed a significant decrease of Seebeck coefficient keeping the electrical conductivity almost intact, while Ni-exchanged samples for Na showed a lower electrical conductivity than that of the non-substituted sample with keeping the Seebeck coefficient unchanged. These results suggest that Ni cations introduced to the Co site decouples the Co-Co spin exchange, whereas those at the Na site compensates positive holes by providing conduction electrons.
    Translated title of the contributionSite-Selective Substitution by Transition Metal Cations for NaCo_2O_4 via Ion-Exchange
    Original languageJapanese
    Pages (from-to)400-404
    Number of pages5
    JournalJournal of the Ceramic Society of Japan
    Volume113
    Issue number1318
    DOIs
    Publication statusPublished - Jun 1 2005

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