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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2003

Structural transitions in Cu2O at pressures up to 11 GPa

Résumé

The structural states of Cu2O at pressures between ambient and 11 GPa were re-investigated, using angle-dispersive diffraction, an area detector and synchrotron radiation. Thanks to the latter's naturally high collimation, a hitherto suspected transition from the parent cubic phase to a new tetragonal phase was experimentally confirmed at pressures between 0.7 and 2.2 GPa, depending on the hydrostaticity of the pressure medium used. The other transformation, into a pseudocubic phase, was detected at about 8.5 GPa. In the same pressure range, the application of pressure also resulted in a general and strong broadening of the diffraction peaks. This broadening is attributed to the presence of microscopic strains and a reduction in grain size down to the nanocrystalline scale.

Domaines

Matériaux
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Dates et versions

hal-00417999 , version 1 (17-09-2009)

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Citer

Denis Machon, Vitaly Sinitsyn, Vladimir P. Dmitriev, I. K. Bdikin, L. S. Dubrovinsky, et al.. Structural transitions in Cu2O at pressures up to 11 GPa. Journal of Physics: Condensed Matter, 2003, 15 (43), pp. 7227-7235. ⟨10.1088/0953-8984/15/43/007⟩. ⟨hal-00417999⟩
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