Preparative methodsScaleMacroTopdownmmEquiangle extrusionRapidsolidificationMicroIntermediate0OOmm00?茶MechanicalalloyingBulknanostructuredMicromachiningsolid0800888BottomupNano8nm
Preparative methods
Preparativemethods1) Ceramic methodsIn its simplest form, ceramic method consistsof heating together two solids which react to formthe required product.This method is used widely both industriallyand in the laboratory; the first high temperaturewere, for example, madebysuperconductorsceramic method
Preparative methods 1) Ceramic methods In its simplest form, ceramic method consists of heating together two solids which react to form the required product. This method is used widely both industrially and in the laboratory; the first high temperature superconductors were, for example, made by ceramic method
Consists of heating two non-volatile solids whichreact to form the required product.The solid-state method can be used to prepare awhole range of materials including mixed metaloxides, sulfides, nitrides, aluminosilicates, ect.heat to 1300°0ZrO, (s) + SiO2(s) > ZrSiO4 (s)
Consists of heating two non-volatile solids which react to form the required product. The solid-state method can be used to prepare a whole range of materials including mixed metal oxides, sulfides, nitrides, aluminosilicates, ect
BATamman's Rule suggestsa temperature of abouttwo-thirds of the meltingOriginal interfacepoint (K) of the lowermelting reactant is neededicBAto have reaction to occurKin a reasonable time.Product LayerPieces half the original size.Piecesonequartertheoriginal size.Piecesoneeighththeoriginal sizeTwicethesurlaceareaFourtimesthesurfaceareaEighttimesthesurfaceareaA=24cm2A=6cm2A=12cm2A=48cm2
Tamman’s Rule suggests a temperature of about two-thirds of the melting point (K) of the lower melting reactant is needed to have reaction to occur in a reasonable time
The sample might be ground, then heated in atantalumtube forhightemperature reactions (to2300K)
The sample might be ground, then heated in a tantalum tube for high temperature reactions (to 2300K)