Structural study of FeSi2 under pressure

The structural properties of β- and α-FeSi2 were examined by high-pressure x-ray diffraction at room temperature. In β-FeSi2, the lattice compression in the longest a axis is larger than in the b and c axes. The expected pressure-induced quenching by the Jahn-Teller effect on γ-FeSi2 was not achieve...

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Bibliographic Details
Published in:Journal of applied physics 2004-11, Vol.96 (9), p.4903-4908
Main Authors: Takarabe, K., Ikai, T., Mori, Y., Udono, H., Kikuma, I.
Format: Article
Language:English
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Summary:The structural properties of β- and α-FeSi2 were examined by high-pressure x-ray diffraction at room temperature. In β-FeSi2, the lattice compression in the longest a axis is larger than in the b and c axes. The expected pressure-induced quenching by the Jahn-Teller effect on γ-FeSi2 was not achieved in the pressure range investigated. The bulk modulus B0 of β-FeSi2 and its derivative B0′ were determined to be 243.5GPa and 3.2GPa, respectively. A high-pressure phase, tentatively assigned to be tetragonal, appeared at about 20GPa. For α-FeSi2, a higher temperature phase of β-FeSi2, the bulk modulus B0 and its derivative B0′ were determined to be 183GPa and 6.2GPa, respectively. The experimental values of B0 are compared with the values estimated by various first-principles calculations, where the characteristic tendency is shown.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1778481