Ca_(0.61)Nd_(0.26)TiO_3粉体:熔盐法制备及烧结特性

Ca_(0.61)Nd_(0.26)TiO_3 Powder:Preparation by Molten Salt Method and Sintering Characteristics

钙钛矿结构的（Ca1-x Ln2/3x）TiO3体系是CaTiO3中的Ca^2＋被三价的稀土离子Ln^3＋（Ln=La．Nd和Sm等稀土元素）不等价置换所形成的固溶体，该固溶体具有高介电常数、高品质因数等特点，这在微波器件小型化应用中具有重要的意义。

Pure Ca0.61Nd0.26TiO3 powder was prepared by molten salt method at temperature ranging from 600 ℃ to 900 ℃, using CaCO3, TiO2 and Nd203 as raw materials and a mixture of KOH and KNO3 as the flux. The results reveal that the morphology and the microstructure of Ca0.61Nd0.26TiO3 are related to the calcination temperature, salt content （S, the mass ratio of reactant to salt） and the constitution of salt （R, the mass ratio of KNO3 to KOH）. The S and R affect the formation temperature of Ca0.61Nd0.26TiO3. When S=1/2 and R =15, pure Ca0.61Nd0.26TiO3 is successfully prepared at 600 ℃. The process for growing of Ca0.61Nd0.26TiO3 is controlled by interface reaction, and changes of S and R affect the morphology of Ca0.61Nd0.26TiO3. Ca0.61Nd0.26TiO3 can be sintered densely at 1250 ℃.