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1、Availableonlineatwww.sciencedirect.comDiamond&RelatedMaterials17(2008)931–936www.elsevier.com/locate/diamondGraphite-to-diamondtransformationinducedbyultrasoundcavitationa,ca,⁎baA.Kh.Khachatryan,S.G.Aloyan,P.W.May,R.Sargsyan,adV.A.Khachatryan,V.S.BaghdasaryanaInstituteof
2、GeneralandInorganicChemistryofArmenianNationalAcademyofSciences,10Argutyan2District,0051,Yerevan,ArmeniabSchoolofChemistry,UniversityofBristol,Cantock'sClose,BristolBS8ITS,U.K.cInstituteofChemicalPhysicsofArmenianNationalAcademyofSciences5/2ParuirSevakSt.,0044Yerevan,Arm
3、eniadYerevanPhysicsInstitute2AlikhanianBr.St.,0036Yerevan,ArmeniaReceived5September2007;receivedinrevisedform14January2008;accepted24January2008Availableonline13February2008AbstractDiamondmicrocrystalshavebeensynthesizedusingultrasoniccavitationofasuspensionofhexagonalgr
4、aphiteinvariousorganicliquidmedia,atanaveragebulktemperatureoftheliquidupto120°Candatatmosphericpressure.Theyieldofdiamondisupto10%bymass.Thediamondswerecharacterizedbyscanningelectronmicroscopy,X-raydiffractionandlaserRamanspectroscopy.Analysisofthecrystallitesizedistri
5、butionshowedthatthediamondswerenearlymono-dispersed,havingasize6or9μm±0.5μm,withcubic,crystallinemorphology.©2008ElsevierB.V.Allrightsreserved.Keywords:Ultrasoundcavitation;Microcrystallinediamond1.Introductiondensities,asaresultoftherapidcollapseofcavitationbubblesprodu
6、cedinasuitableliquidmedium[2].TheoverallpictureofSynthesisofdiamondbyavarietyofchemicalandphysicalcavitationbubbleformationisasfollows.Asanelastic(sound)routesiscurrentlyatopicofgreatscientificandcommercialwavepassesthroughaliquid,itproducesalternatingregionsofinterest.P
7、roductionofsinglecrystaldiamondparticlesofsizesreduceddensity(negativepressure)andincreaseddensitybetweenafewnmandseveralmmusuallyrequireprocess(positivepressure).Ifthesoundwaveissufficientlyintense,pressuresinexcessoftensofthousandsofatmospheresandthereduceddensityregio
8、nsformcavities(bubbles)filledwithtemperaturesN2000Kinordertoconvertgraphiteintothesaturatedvaporoftheli
