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Pressure-induced structural evolution and amorphization in Eu3Ga5O12
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Image of FIG. 1.
FIG. 1.

The crystal structure of the EGG garnet, (a) shows one crystal unit cell, and (b) depicts part of the unit cell in which the Eu3+ ion lies between the octahedra and tetrahedra. In the cubic structure, Ga 3+ occupies the octahedral site at the (0, 0, 0) position, Ga 3+ occupies the tetrahedral site with (3/8, 0, 1/4) coordinate, and Eu3+ is at the dodecahedral site with the (1/8, 0, 1/4) coordinate, respectively. Oxygen has the general coordinate (x, y, z).

Image of FIG. 2.
FIG. 2.

Representative x-ray diffraction pattern of EuGaO (EGG) with the Rietveld refinement at ambient conditions.

Image of FIG. 3.
FIG. 3.

Representative angle-dispersive x-ray diffraction patterns (wavelength λ = 0.6199 Å) of EGG at high pressures. The patterns above 50 GPa were collected in the first run mixed with Pt, while the spectra below 50 GPa were collected in the second run without Pt.

Image of FIG. 4.
FIG. 4.

Comparison of the x-ray diffraction patterns before and after laser-heating the EGG garnet. The bottom spectrum represents the x-ray diffraction of the cubic garnet phase, and the top shows the high-pressure orthorhombic phase after laser-heating.

Image of FIG. 5.
FIG. 5.

Experimental P-V data of EGG. The inset is pressure dependence of the distances between nearest polyhedra (dodecahedra, octahedra, and tetrahedra).

Image of FIG. 6.
FIG. 6.

Characteristic fluorescence spectra for the 5D7F ( = 1, 2) transition of Eu3+ in EuGaO at high pressures. The sharp peak at 16385 cm−1 marked with * represents the laser line.

Image of FIG. 7.
FIG. 7.

Luminescence intensity ratio of the (5D7F) to (5D7F) transitions as a function of pressure.

Image of FIG. 8.
FIG. 8.

Pressure evolution of (a) the Raman spectra of EGG and (b) the corresponding frequencies.


Generic image for table
Table I.

Experimental conditions. Room temperature: RT; Photoluminescence: PL.

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Table II.

Derived vibrational parameters of EuGaO from high-pressure Raman results. : Raman frequency at ambient pressure; dω/dP: pressure derivative of the Raman frequency; γ: mode Grüneisen parameter.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Pressure-induced structural evolution and amorphization in Eu3Ga5O12