V. V. Sinitsyn, V. P. Dmitriev, I. K. Bdikin, D. Machon, L. Dubrovinsky, E. G. Ponyatovsky, H.-P. Weber, “Amorphization of cuprite, Cu<nobr>$_2$</nobr>O, due to chemical decomposition under high pressure”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2004, Volume 80, Issue 11,Pages <nobr>831

This article is cited in 15 papers

CONDENSED MATTER

Amorphization of cuprite, Cu$_2$O, due to chemical decomposition under high pressure

V. V. Sinitsyn^a, V. P. Dmitriev^b, I. K. Bdikin^a, D. Machon^b, L. Dubrovinsky^c, E. G. Ponyatovsky^a, H.-P. Weber^d

^a Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia
^b "Structure of Materials under Extreme Conditions", Swiss-Norwegian Beam Lines at ESRF, F-38043 Grenoble, France
^c Bayerisches Geoinstitut, Universitat Bayreuth, D-95440 Bayreuth, Germany
^d LCr/IPMC/FSB, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland

Abstract: Using synchrotron radiation and a diamond-anvil cell, a structural study of the phase transformations in Cu$_{2}$O is carried out from diffraction data obtained in-situ while heating at a pressure of 30 GPa. Around 140 $^\circ$C we observe a transition of Cu$_{2}$O to an amorphous state, with the amorphous state persisting to about 260 $^\circ$C. Further heating up to 400 $^\circ$C yields at first a nanocrystalline two-phase mixture of Cu+CuO; then with prolonged heating at 400 $^\circ$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.

PACS: 74.50.+r, 74.80.Fp

Received: 03.11.2004

Language: English