【摘要】 采用水热重结晶法对低温液相法制备的Ba0.9Ca0.1TiO3(B0.9C0.1T)浆料进行220℃,3h的水热处理,成功制备了四方相B0.9C0.1T纳米粉体.并对水热重结晶和未水热处理的两种粉体进行了TEM,XRD,Raman,FT-IR,TG和介电性能的表征.研究表明,经水热重结晶后的B0.9C0.1T粉体体系发生从顺电立方相向铁电四方相的转变,羟基缺陷以及CO32-杂质显著减少,粉体形貌由外边缘毛躁的球形转变为四边形.并发现羟基缺陷的减少是影响体系相转变的关键因素.更多还原

【Abstract】 A novel hydrothermal recrystallization route has been developed to produce tetragonal Ba0.9Ca0.1TiO3 nanocrystals. The obtained powders were analyzed by TEM, XRD, Raman spectra, FTIR, TG and dielectric property measurements, and showed much less hydroxyl lattice defects, higher purity and bet- ter crystallinity than those prepared by low-temperature aqueous synthesis (LTAS) method. The hydroxyl lattice defect was key factor to influence the phase transition from paraelectric cubic to ferroelectric tetrago- nal structure.更多还原