1. Purification by sublimation 2. Synthesis 3. Sublimation or chemical vapor transport Crystal growth by vapor transport Source material Crystal T C T S Temperature V » 1-10 mm/day Growth e.g. D T = 3K Nucleation e.g. D T = 10K Sublimation T = source temperature S T = crystal temperature C D T = T - T S C Length 1E-3 0.01 0.1 1 1E-4 1E-3 0.01 V max (mm/h) Partial argon pressure (atm) Cd: 290 °C Zn: 420 °C Mg: 590 °C Cd Zn Mg 0.5 mm 0.5 mm Raman spectra of ZnSe crystals with different isotope composition Normalized intensity [arb. Units] LC Raman Shift [cm ] -1 Zn Se Zn Se Zn Se Zn Se Zn Se Zn Se 64 80 nat nat 68 76 dis 80 68 dis 68 80 64 76 Zn Se ZnO, ZnSe, ZnTe, CdS, CdSe, Ag S, CuCl, CuBr, 2 CuI, AgI, TiO , C , C , 2 60 70 Zn, Cd, Mg etc. Crystals grown: KBr GeS TlBr A view of vapor growth equipment 64 76 Zn Se ZnSe, ZnTe, CdS 10 mm 64 18 Zn O