| Summary: | 碩士 === 國立臺南大學 === 材料科學系碩士班 === 100 === In this study, the low-cost hydrothermal method is used to prepare K2Ti6O13 and Bi0.5(Na1-xKx)0.5TiO3. Using closed reaction vessel of the high temperature、high pressure, the liquid on the solubility significantly increases of the solid material, and then reaction nucleation and growth and precipitation of nano-size powder. The design parameters of this experiment contain the solvent concentration and powder hydrothermal temperature. Solvent concentration will determine the reaction; the temperature of the heat treatment will help the growth of the grain. The phase formation、grain morphology and grain size of Bi0.5(Na1-xKx)0.5TiO3 and K2Ti6O13 were examined by XRD、Raman、SEM and TEM, respectively. The experimental results showed that the nanoscale K2Ti6O13 can be composed when the temperature of the hydrothermal treatment at 130 ℃, 24 hours, 10 M KOH Molarity. Bi0.5(Na1-xKx)0.5TiO3 can be successfully prepared at 180 ℃、12 hours of hydrothermal treatment、the concentration of 12 M ,as the potassium doping amount increases gradually, the phase transfers from Bi0.5Na0.5TiO3 phase transition into Bi0.5K0.5TiO3 phase.
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