关键词: 钛酸镧;低损耗;陶瓷介质

Abstract: La2O3-TiO2 system ceramic dielectric materials was synthesized by solid phase reaction.Its phase structure，morphology and chemical composition were investigated by XRD，SEM，EDS.Dielectric behavior was measured with high accuracy meter.It is found that when the ratio of La2O3 to TiO2 is 1 to 2 and 2 to 9，very low dielectric loss tangent can be obtained,and the main phase is La2Ti2O7 and La4Ti9O24.The complex phases of La2／3TiO3 and La4Ti9O24 can be obtained when the ratio is 1 to 3. La2／3TiO3 with the perovskite structure-defect increases the dielectric losses.The Si impurity deposited in the grain boundaries is good for liquid phase sintering.