Equation of State and High Pressure Irreversible Amorphization in Y[subscript 3] Fe[subscript 5]O[subscript 12]
- MXPL-M
The change of crystal structure in yttrium iron garnet Y{sub 3}Fe{sub 5}O{sub 12} was studied at room temperature at high pressures up to {approx}55 GPa by the x-ray diffraction technique in diamond anvil cells. At a pressure of about {approx}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 FeO{sub 6} octahedral complexes with disordered orientations of local axis and of randomly arranged others ion fragments with the overall Y{sub 3}Fe{sub 5}O{sub 12} composition. For the amorphous phase, it was evaluated that the bulk modulus of FeO{sub 6} octahedral complexes is about 260 GPa.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007690
- Journal Information:
- JETP Lett., Vol. 83, Issue (1) ; 01, 2006
- Country of Publication:
- United States
- Language:
- ENGLISH
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