《Graphite-to-diamond transformation induced by ultrasound cavitationdrm17-931》.pdf

Available online at Diamond Related Materials 17 (2008) 931 – 936 /locate/diamond Graphite-to-diamond transformation induced by ultrasound cavitation A.Kh. Khachatryan a,c , S.G. Aloyan a,⁎, P.W. May b , R. Sargsyan a , V.A. Khachatryan a , V.S. Baghdasaryan d a Institute of General and Inorganic Chemistry of Armenian National Academy of Sciences, 10 Argutyan 2 District, 0051, Yerevan, Armenia b School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 ITS, U.K. c Institute of Chemical Physics of Armenian National Academy of Sciences 5/2 Paruir Sevak St., 0044 Yerevan, Armenia d Yerevan Physics Institute 2 Alikhanian Br. St., 0036 Yerevan, Armenia Received 5 September 2007; received in revised form 14 January 2008; accepted 24 January 2008 Available online 13 February 2008 Abstract Diamond microcrystals have been synthesized using ultrasonic cavitation of a suspension of hexagonal graphite in various organic liquid media, at an average bulk temperature of the liquid up to 120°C and at atmospheric pressure. The yield of diamond is up to 10% by mass. The diamonds were characterized by scanning electron microscopy, X-ray diffraction and laser Raman spectroscopy. Analysis of the crystallite size distribution showed that the diamonds were nearly mono-dispersed, having a size 6 or 9μm ± 0.5μm, with cubic, crystalline morphology. © 2008 Elsevier B.V. All rights reserved. Keywords: Ultrasound cavitation; Microcrystal