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High-pressure x-ray diffraction and Raman spectra study of indium oxide
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Image of FIG. 1.
FIG. 1.

Crystal structures of (a) and (b) corundum-. Different types of In atoms are marked by different colors.

Image of FIG. 2.
FIG. 2.

Angle dispersive XRD patterns of at selected pressures at room temperature. The peak labeled L as inset is zoomed to show the doublet features in the spectrum. Arrow indicates the new diffraction peaks at 15.3 GPa and 23.4 GPa, respectively. The tick marks indicate the positions of calculated Bragg reflections of (dashed) and corundum- (real line), which are indexed on the top pattern.

Image of FIG. 3.
FIG. 3.

Pressure-Volume data of at 300 K. The solid hexagon represents the cubic phase. The line represents the fit to the Birch–Murnaghan equation.

Image of FIG. 4.
FIG. 4.

Pressure dependencies of (left curve) and (right curve) for .

Image of FIG. 5.
FIG. 5.

Raman spectra of at ambient conditions and at high pressures. For clarity the spectra have been divided into two parts: (a) and (b) . The six Raman modes are labeled , , , , , and , respectively.

Image of FIG. 6.
FIG. 6.

Pressure dependence of Raman frequency shifts in at room temperature. Vertical dotted lines indicate phase transition pressures.


Generic image for table
Table I.

Unit cell parameters and volume of at various pressures. Derived pseudocubic values are given for the cubic phase along with the primitive hexagonal lattice constants that were directly determined from the diffraction data. At 15.3 GPa lattice constants for both the hexagonal and cubic phases are given as both were present in significant amounts.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-pressure x-ray diffraction and Raman spectra study of indium oxide