This article is cited in 23 papers

CONDENSED MATTER

Equation of State and High Pressure Irreversible Amorphization in $\mathrm{Y_3Fe_5O_{12}}$

A. G. Gavriliuk^abc, V. V. Struzhkin^c, I. S. Lyubutin^a, M. I. Eremets^d, I. A. Trojan^b, V. V. Artemov<sup>a

a</sup> Institute of Cristallography RAS
^b Institute for High Pressure Physics RAS
^c Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington DC 20015
^d Max Planck Institute for Chemistry, 55020 Mainz, Germany

Abstract: The change of crystal structure in the yttrium iron garnet $\mathrm{Y_3Fe_5O_{12}}$ was studied at room temperature at high pressures up to $\sim55\,$GPa by the X-ray diffraction technique in diamond anvil cells. At the pressure about $\sim50$ GPa the drastic change in the X-ray diffraction pattern was observed indicating a transition into an amorphous-like state. At the pressure increase the bulk modulus of YIG was found to be $193\pm4\,$GPa. It was also found that the amorphous state was retained after decompression down to ambient pressure. From the shape of X-ray patterns in “amorphous” phase, it was concluded that the local atomic structure consists of iron-oxygen $\mathrm{FeO_6}$ octahedral complexes with disordered orientations of local axis and of the randomly arranged others ions fragments with the overall $\mathrm{Y_3Fe_5O_{12}}$ composition. For amorphous phase it was evaluated that the bulk modulus of $\mathrm{FeO_6}$ octahedral complexes is about 260 GPa.

PACS: 61.50.Ks, 64.30.+t, 71.30.+h, 81.40.Vw

Received: 17.11.2005

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2006, 83:1, 37–41

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