Physics and Chemistry of Minerals

, Volume 31, Issue 10, pp 660–670 | Cite as

P - V - T equation of state of stishovite to the mantle transition zone conditions

  • Yu Nishihara
  • Keisuke Nakayama
  • Eiichi Takahashi
  • Tomohiro Iguchi
  • Ken-ìchi Funakoshi


In-situ synchrotron X-ray diffraction experiments were conducted using the SPEED-1500 multi-anvil press of SPring-8 on stishovite SiO2 and pressure-volume-temperature data were collected at up to 22.5 GPa and 1,073 K, which corresponds to the pressure conditions of the base of the mantle transition zone. The analysis of room-temperature data yielded V0=46.56(1) Å3, KT 0=296(5) GPa and K T =4.2(4), and these properties were consistent with the subsequent thermal equation of state (EOS) analyses. A fit of the present data to high-temperature Birch-Murnaghan EOS yielded (∂K T /∂T) P =−0.046(5) GPa K−1 and α= a + bT with values of a =1.26(11)×10–5 K–1 and b =1.29(17)×10–8 K–2. A fit to the thermal pressure EOS gives α0=1.62(9)×10−5 K–1, (∂ K T /∂ T) V =−0.027(4) GPa K−1 and (∂2P /∂T 2) V =27(5)×10–7 GPa K−2. The lattice dynamical approach by Mie-Grüneisen-Debye EOS yielded γ0=1.33(6), q =6.1(8) and θ0=1160(120) K. The strong volume dependence of the thermal pressure of stishovite was revealed by the analysis of present data, which was not detectable by the previous high-temperature data at lower pressures, and this yields (∂ K T /∂ T) V ≠0 and q ≠1. The analyses for the fictive volume for a and c axes show that relative stiffness of c axis to a axis is similar both on compression and thermal expansion. Present EOS enables the accurate estimate of density of SiO2 in the deep mantle conditions.


Stishovite Equation of state High pressure and high temperature Synchrotron radiation 



We thank M. Shindo for his helpful support for the in situ X-ray diffraction experiments, J. Tuff for reading the manuscript and T. Tsuchiya and J. Korenaga for helpful comments. P - V - T measurements were conducted by K. Nakayama as a part of his MSc Thesis. Constructive comments by D. Andrault and I. Jackson were helpful. The in situ X-ray diffraction experiments were performed by using the SPEED-1500 system at BL04B1 in SPring-8 (proposal no. 2001B0486-CD-np). This work was supported by the grant 12002006 from the Ministry of Education, Culture, Sports, Science, and Technology Japan. Y.N. is grateful for the Research Fellowships of the Japan Society of the Promotion of Science for Young Scientists.


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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Yu Nishihara
    • 1
    • 2
  • Keisuke Nakayama
    • 2
  • Eiichi Takahashi
    • 2
  • Tomohiro Iguchi
    • 2
  • Ken-ìchi Funakoshi
    • 3
  1. 1.Department of Geology and GeophysicsYale UniversityNew HavenUSA
  2. 2.Magma Factory, Earth and Planetary SciencesTokyo Institute of TechnologyTokyoJapan
  3. 3.Japan Synchrotron Radiation Research InstituteKouto, Mikazuki-cho, Sayo-gunHyogoJapan

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