Real-space distribution of local WO 4 ordering in negative thermal expansive ZrW 2O 8

Yukio Sato, Yasuhisa Yamamura, Kazuya Saito, Yuichi Ikuhara

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    9 Citations (Scopus)

    Abstract

    Solids usually expand when they are heated. This is quite common behavior of solids; however, there are some exceptions. Zirconium tungstate (ZrW 2O 8) is a prototype material among them, because it has the highest degree of negative thermal expansion (NTE) over broad temperature range. Intensive investigation of NTE mechanisms has suggested the importance of metal-oxygen polyhedra. However, most of the studies have been done with volume-averaged techniques, and microscopic information has been lacking. Here, our electron microscopy observations have unraveled the real-space distribution of local WO 4 tetrahedra ordering for the first time. We have found that (i) the WO 4 ordering is partly inverted; (ii) WO 4 is disordered on the nanoscale; and (iii) doping with scandium enhances the WO 4 disordering. These findings led to construction of a microstructure model for ZrW 2O 8, providing a new structural perspective for better understanding of local structure and its role in phase transitions.

    Original languageEnglish
    Pages (from-to)13942-13945
    Number of pages4
    JournalJournal of the American Chemical Society
    Volume134
    Issue number34
    DOIs
    Publication statusPublished - 2012 Aug 29

    ASJC Scopus subject areas

    • Catalysis
    • Chemistry(all)
    • Biochemistry
    • Colloid and Surface Chemistry

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