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Elasticity and sound velocities of polycrystalline Mg3Al2(SiO4)3 garnet up to 20 GPa and 1700 K
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10.1063/1.4736407
/content/aip/journal/jap/112/1/10.1063/1.4736407
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4736407

Figures

Image of FIG. 1.
FIG. 1.

Observed (cross) and fitted (line) x-ray diffraction pattern of the synthetic polycrystalline Mg3Al2(SiO4)3 garnet at ambient condition, which indicates that the synthetic garnet sample for the present ultrasonic measurements is a single phase of pyrope garnet. Residuals are shown at the bottom of the figure.

Image of FIG. 2.
FIG. 2.

Cross section of the cell assembly for in situ acoustic and x-ray measurements at high pressure and high temperature. Gold foils with thickness of 2 μm were inserted at both sides of the sample as markers of x-radiography image; Gold foils between buffer rod and sample, as well as buffer rod and WC anvil were used to improve the mechanical coupling.

Image of FIG. 3.
FIG. 3.

(a). TEM image showing the microstructure of the polycrystalline Mg3Al2(SiO4)3 pyrope garnet recovered from the present sound velocity measurements at pressures up to 20 GPa and temperatures up to 1700 K. The average grain size of the recovered sample observed from TEM is about 1-2 μm. The corresponding selected area electron diffraction (SAED) pattern, as an up-left inset, proves that the obtained sample is cubic. (b). Representative Raman spectra collected from the present Mg3Al2(SiO4)3 pyrope sample at ambient condition before compression (bottom) and after decompression (upper).

Image of FIG. 4.
FIG. 4.

Comparison of compressional (Vp) and shear (Vs) wave velocities of polycrystalline Mg3Al2(SiO4)3 pyrope garnet from this study with previous data (Refs. 8–11).

Image of FIG. 5.
FIG. 5.

X-ray density changes of polycrystalline pyrope garnet as a function of pressure and temperature determined form in situ x-ray diffraction measurements. The solid lines shows the polynomial fitting results based on the calculated densities, yielding a zero-pressure density of ρ = 3.566(1) g/cm3, which is in good agreement with earlier results of 3.57 and 3.56(2) by Sinogeikin and Bass (Ref. 12) and Gwanmesia et al. (Ref. 8), respectively.

Image of FIG. 6.
FIG. 6.

(a) P-wave (Vp) and (b) S-wave (Vs) velocities of polycrystalline Mg3Al2(SiO4)3 pyrope garnet at high pressure and high temperature obtained from the present ultrasonic measurement. The solid lines are calculated from the two-dimensional (P-T) linear at entire P-T range.

Image of FIG. 7.
FIG. 7.

(a) Bulk (Ks) and (b) shear (G) modulus of polycrystalline Mg3Al2 (SiO4)3 pyrope at high pressure and high temperature obtained from the present ultrasonic measurement. The solid lines are calculated from the two-dimensional (P-T) linear at entire P-T range.

Image of FIG. 8.
FIG. 8.

Compressional (P-) and shear (S-) wave velocities changes of polycrystalline Mg3Al2(SiO4)3 pyrope garnet as a function of temperature at some representative pressures in the mantle transition region. The solid lines show the P- and S-wave velocities obtained from the present study, while the dashed lines represent those based on recent study by Irifune et al. (Ref. 31).

Tables

Generic image for table
Table I.

Experimental conditions and results for polycrystalline Mg3Al2(SiO4)3 garnet.

Generic image for table
Table II.

Elastic properties of polycrystalline Mg3Al2(SiO4)3 garnet, compared with previous studies.

Generic image for table
Table III.

Elastic properties of polycrystalline Mg3Al2(SiO4)3 garnet and Y3Al2(AlO4)3 garnet as well as some typical materials in MgO-Al2O3-SiO2 system from previous studies.

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/content/aip/journal/jap/112/1/10.1063/1.4736407
2012-07-13
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Elasticity and sound velocities of polycrystalline Mg3Al2(SiO4)3 garnet up to 20 GPa and 1700 K
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4736407
10.1063/1.4736407
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