Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 75, Issue 1-3, Pages 32-38Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0254-0584(02)00026-3
Keywords
phase transition; Cu2S; differential scanning calorimetry; X-ray diffraction
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Phase transitions in the Cu-2-S nanowires have been studied as a function of temperature and pressure. Differential scanning calorimetry (DSC) shows an endothermic process at 101.8degreesC upon heating, corresponding to the phase transition from gamma-Cu2S (monoclinic) to beta-Cu2S (hexagonal) in the bulk (103.5degreesC). However, the reverse phase transition was found to be much lower (74.8 degreesC). X-ray diffraction (XRD) demonstrates that the c-axis of gamma-Cu2S is transformed to the c-axis of beta-Cu2S owing to the positional disorder of the Cu atoms. Two high-pressure phases of Cu,S have been identified using a diamond anvil cell and the energy-dispersive XRD technique. (C) 2002 Elsevier Science B.V. All rights reserved.
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