Physics and Chemistry of Minerals

, Volume 45, Issue 10, pp 995–1001 | Cite as

Thermal equation of state of MgSiO4H2 phase H determined by in situ X-ray diffraction and a multianvil apparatus

  • Masayuki NishiEmail author
  • Jun Tsuchiya
  • Takeshi Arimoto
  • Sho Kakizawa
  • Takehiro Kunimoto
  • Yoshinori Tange
  • Yuji Higo
  • Tetsuo Irifune
Original Paper


Phase H (MgSiO4H2) is the high-pressure form of dense hydrous silicate that could deliver surface water into the lower mantle. In this study, we determined the thermal equations of the state of phase H using in situ X-ray diffraction measurements, under conditions ranging from 34 to 62 GPa and 300 and 1300 K, using a multianvil apparatus. Analysis of the data, based on the Mie–Grüneisen–Debye model using third-order Burch–Murnaghan equations at a reference pressure of 35 GPa, yielded the following results Vref = 49.61 ± 0.01 Å3, Kref = 344.6±4.1 GPa, \(K_{{{\text{ref}}}}^{\prime }\) = 3.05 ± 0.32, θref = 974 ± 146 K, γref = 1.8 ± 0.1, and q = 1.79 ± 0.55. The compressibility of phase H observed in this study agrees well with that derived from theoretical calculations in pressure regions where hydrogen bond symmetrization is predicted. It was also found that the volume and compressibility of phase H and δ-AlOOH were similar.


Dense hydrous magnesium silicates MgSiO4H2 phase H X-Ray diffraction Multianvil apparatus Equation of state 



We appreciate helpful comments from H. Dekura regarding the experimental results and data analysis. We also thank Z. Youmo for his helpful support during the experiments. The in situ X-ray measurements were conducted at SPring-8 (proposal numbers 2016B0075 and 2017B0075). This work was supported by MEXT/JSPS KAKENHI (Grant No. JP15H05469 to MN, JP15H05829 and JP25220712 to MN and TI, JP15H05834 to JT).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Geodynamics Research CenterEhime UniversityMatsuyamaJapan
  2. 2.Earth and Life Science InstituteTokyo Institute of TechnologyTokyoJapan
  3. 3.Japan Synchrotron Radiation Research InstituteHyogoJapan

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