Equation of state and high-pressure irreversible amorphization in Y3Fe5O12 |
| |
Authors: | A G Gavriliuk V V Struzhkin I S Lyubutin M I Eremets I A Trojan V V Artemov |
| |
Institution: | (1) Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC, 20015, USA;(2) Institute for High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia;(3) Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333, Russia;(4) Max-Planck Institute fur Chemie, 55020 Mainz, Germany |
| |
Abstract: | The change of crystal structure in yttrium iron garnet Y3Fe5O12 was studied at room temperature at high pressures up to ∼55 GPa by the x-ray diffraction technique in diamond anvil cells.
At a pressure of about ∼50 GPa, a drastic change in the x-ray diffraction pattern was observed indicating the transition into
an amorphouslike state. When the pressure was increased, the bulk modulus of YIG was found to be 193 ± 4 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 the “amorphous” phase, it was concluded that the local atomic structure consists of iron-oxygen FeO6 octahedral complexes with disordered orientations of local axis and of randomly arranged others ion fragments with the overall
Y3Fe5O12 composition. For the amorphous phase, it was evaluated that the bulk modulus of FeO6 octahedral complexes is about 260 GPa.
The text was submitted by the authors in English. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|