Compressibility of pyrochlore-type MgZrSi2O7 determined by in situ X-ray diffraction in a large-volume high pressure apparatus

Shuangmeng Zhai, Shuangming Shan, Daisuke Yamazaki, Ken Ichi Funakoshi

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    6 Citations (Scopus)

    Abstract

    The pyrochlore-type MgZrSi2O7 has been investigated by in situ synchrotron energy-dispersive X-ray diffraction measurements up 24.3 GPa at room temperature in a multianvil high pressure apparatus. The pressure has been calculated using an internal gold metal pressure calibrant. No phase transformation was observed in this study. A third-order Birch-Murnaghan equation of state was used to fit the pressure-volume data. The fitting gives a volume of V0 = 802.8 ± 0.2 Å3, an isothermal bulk modulus of KT = 249 ± 12 GPa, and first pressure derivative of KT = 3.2 ± 1.3. If K T is fixed as 4, KT is obtained as 241.8 ± 2.6 GPa. Compared with zirconate or titanate pyrochlores, MgZrSi 2O7 shows a smaller compressibility due to a larger cation radii ratio (r Mg, Zr/r Si).

    Original languageEnglish
    Pages (from-to)1-7
    Number of pages7
    JournalHigh Pressure Research
    Volume33
    Issue number1
    DOIs
    Publication statusPublished - Mar 1 2013

    Keywords

    • Equation of state
    • High pressure
    • MgZrSiO
    • Pyrochlore
    • X-ray diffraction

    ASJC Scopus subject areas

    • Condensed Matter Physics

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