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

doi:10.1080/08957959.2012.750653

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

Institute for Planetary Materials

Research output: Contribution to journal › Article › peer-review

7 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 K_T = 249 ± 12 GPa, and first pressure derivative of K^′_T = 3.2 ± 1.3. If K ^′_T is fixed as 4, K_T 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 language	English
Pages (from-to)	1-7
Number of pages	7
Journal	High Pressure Research
Volume	33
Issue number	1
DOIs	https://doi.org/10.1080/08957959.2012.750653
Publication status	Published - Mar 1 2013

Keywords

Equation of state
High pressure
MgZrSiO
Pyrochlore
X-ray diffraction

ASJC Scopus subject areas

Condensed Matter Physics

Access to Document

10.1080/08957959.2012.750653

Cite this

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

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 {\AA}3, an isothermal bulk modulus of KT = 249 ± 12 GPa, and first pressure derivative of K′T = 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).",

keywords = "Equation of state, High pressure, MgZrSiO, Pyrochlore, X-ray diffraction",

author = "Shuangmeng Zhai and Shuangming Shan and Daisuke Yamazaki and Funakoshi, {Ken Ichi}",

year = "2013",

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AU - Zhai, Shuangmeng

AU - Shan, Shuangming

AU - Yamazaki, Daisuke

AU - Funakoshi, Ken Ichi

PY - 2013/3/1

Y1 - 2013/3/1

N2 - 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 K′T = 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).

AB - 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 K′T = 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).

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