Mn改性Na_(0.5)Bi_(8.5)Ti_7O_(27)铋层状陶瓷结构与电性能的研究

Structure and Electrical Properties of Mn-Modified Bismuth Layer Na_(0.5)Bi_(8.5)Ti_7O_(27) Ceramics

采用固相法制备了Na_(0.5)Bi_(8.5)Ti_7O_(27)+xmol%MnCO_3(NBTO-M_(n-x),x=0.00,3.00,5.00,7.00)铋层状压电陶瓷材料,系统研究了MnCO_3的引入对Na_(0.5)Bi_(8.5)Ti_7O_(27)共生结构铋层状陶瓷物相结构、微观结构以及电性能的影响.结果表明:所有样品均为单一的共生结构铋层状陶瓷材料,Mn的引入没有改变其物相结构;适量的Mn掺入能明显降低Na_(0.5)Bi_(8.5)Ti_7O_(27)陶瓷的介电损耗tanδ,改善其电性能,当x=5.00时,其综合性能最佳:ρ、d_(33)、Q_m、k_p和k_t分别为ρ=6.90g/cm^3、d_(33)=19pC/N、Q_m=3230、k_p=11.00%、k_t=13.40%,该组分陶瓷样品具有良好的热稳定性。

Bismuth layer-structured ceramics Na0. 5Bi8. 5Ti7O27＋ xmol% MnCO3（ NBTO-Mn-x,x =0. 00,3. 00,5. 00,7. 00） were prepared by the solid state reaction method. The effects MnCO3 addition on the phase,the microstucture and electrical properties of ceramics have been investigated in detail. The results indicate that the NBTO-Mn-x materials possess intergrowth structure,and the structure is not changed by the Mn modification. The electrical properties of NBTO-based ceramics are improved significantly by the addition of MnCO3,when x =5.00,the ceramics achieve an optimum performance： ρ = 6.90 g/cm3,d33= 19 pC / N,Qm=3230,kp= 11. 00%,kt= 13. 40%. Moreover,the researches on thermal annealing studies indicated that the ceramics possess stable piezoelectric properties.