Structural phase transition in d-benzil characterised by capacitance measurements and neutron powder diffraction

D. J. Goossens*, Xiaodong Wu, M. Prior

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    The ferroelectric phase transition in deuterated benzil, C 14H10O2, has been studied using capacitance measurements and neutron powder diffraction. Hydrogenous benzil shows a phase transition at 83.5 K from a high temperature P3121 phase to a cell-doubled P21 phase. The phase transition in d-benzil occurs at 88.1 K, a small isotope effect. Neutron powder diffraction was consistent with a low temperature phase of space group P21. Upon deuteration the transition remained first-order and the dynamics of the phenyl ring dominated the behaviour. The isotope effect can be attributed to the difference in mass and moment of inertia between C6H5 and C6D 5.

    Original languageEnglish
    Pages (from-to)543-545
    Number of pages3
    JournalSolid State Communications
    Volume136
    Issue number9-10
    DOIs
    Publication statusPublished - Dec 2005

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