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Phase transformations in hypereutectic MgO-Y2O3 nanocomposites at 5.5 GPa
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10.1063/1.4807913
/content/aip/journal/jap/113/20/10.1063/1.4807913
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807913
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Synchrotron energy dispersive x-ray diffraction spectra showing the evolution of phases in the 0.8MgO-0.2YO nanocomposite system: (a) (298 K, 0 GPa, 0 min), (b) (298 K, 5.5 GPa, 0 min), (c) (1273 K, 5.5 GPa, 0 min), (d) (1273 K, 5.5 GPa, 120 min), (e) (298 K, 5.5 GPa, 120 min), and (f) (298 K, 0 GPa, 120 min). The background is due to the BN-polymer composite sample holder (outer shell).

Image of FIG. 2.
FIG. 2.

Time-resolved synchrotron energy dispersive x-ray diffraction spectra showing (a) (111) c-MgO, (400) c-YO, (222) c-YO, (b) (134) c-YO, (200) c-MgO, (012) c-YO, and (c) (622) c-YO, (020) m-YO, (440) c-YO reflections, showing no appearance or disappearance of phases at 1273 K and 5.5 GPa over a period of 120 min (c: cubic, h: hexagonal, m: monoclinic).

Image of FIG. 3.
FIG. 3.

Synchrotron energy dispersive x-ray diffraction spectra showing the evolution of phases in the 0.8MgO-0.2YO nanocomposite system: (a) (1273 K, 5.5 GPa, 120 min), (b) (298 K, 5.5 GPa, 120 min), (c) (298 K, 0 GPa, 0 min), showing that the four phase co-existence of c-MgO, c-YO, h-YO, and m-YO is preserved after the thermokinetic cycle.

Image of FIG. 4.
FIG. 4.

Linear shrinkage as measured from the variation of longitudinal macroscopic strain as a function of time under isothermal and isobaric conditions at 1273 K and 5.5 GPa. The overall volumetric shrinkage is 3.45% over a period of 120 min.

Image of FIG. 5.
FIG. 5.

Variation of the MgO cubic unit cell volume with time under isothermal and isobaric conditions at 1273 K and 5.5 GPa. The observed volumetric expansion is ∼0.87% at the end of 120 min, and is primarily attributed to Y dissolution in MgO due to the applied pressure.

Image of FIG. 6.
FIG. 6.

Model proposed in this study showing the variation of cross sectional area between particles/grains and at triple junctions as a function of two particle size (r ≫ r) in a particulate system under pressure.

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/content/aip/journal/jap/113/20/10.1063/1.4807913
2013-05-31
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Phase transformations in hypereutectic MgO-Y2O3 nanocomposites at 5.5 GPa
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/20/10.1063/1.4807913
10.1063/1.4807913
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