Abstract:
Using synchrotron radiation and a diamond-anvil cell, a structural study of the phase transformations in Cu2O is carried out from diffraction data obtained in-situ while heating at a pressure of 30 GPa. Around 140 ∘C we observe a transition of Cu2O to an amorphous state, with the amorphous state persisting to about 260 ∘C. Further heating up to 400 ∘C yields at first a nanocrystalline two-phase mixture of Cu+CuO; then with prolonged heating at 400 ∘C full crystallization of this mixture. The present structural data are the first experimental evidence of solid state amorphization under high pressure as an intermediate stage of the high-pressure decomposition of complex compounds.
Citation:
V. V. Sinitsyn, V. P. Dmitriev, I. K. Bdikin, D. Machon, L. Dubrovinsky, E. G. Ponyatovsky, H.-P. Weber, “Amorphization of cuprite, Cu2O, due to chemical decomposition under high pressure”, Pis'ma v Zh. Èksper. Teoret. Fiz., 80:11 (2004), 831–834; JETP Letters, 80:11 (2004), 704–706
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