Li、Ce掺杂对NBTa-CBN高温压电陶瓷性质的影响研究

采用传统固相反应法制备了Ca_0.5(Na_0.5Bi_0.5)_0.5-3x(Li_0.5Ce_0.5)_3xBi₂TaNb_0.99Mn_0.01O₉(CNBTNM-LC100x)高居里温度(T_C)压电陶瓷。研究了Li、Ce复合离子掺杂对陶瓷结构和电学性质的影响。结果表明,随着Li、Ce掺杂量的增加,CNBTNM-LC100x陶瓷的晶体结构趋于由正交相向四方相转变,压电常数d₃₃逐渐增大,当x＞0.04(x为摩尔分数)时,d₃₃趋于降低。x=0.04时,具有最优的综合电学性能,d₃₃约为15.9 pC/N,600 ℃下直流电阻率ρ约为5.9×10⁵ Ω·cm,介电损耗tan δ(1 MHz)约为7%,T_C约为887 ℃。

Effect of Li、Ce Doping on NBTa-CBN High-Temperature Piezoelectric Ceramic Properties

A Ca_0.5(Na_0.5Bi_0.5)_0.5-3x(Li_0.5Ce_0.5)_3xBi₂TaNb_0.99Mn_0.01O₉(CNBTNM-LC100x) solid-solution piezoelectric ceramic with high Curie temperature (T_C) was prepared using the traditional solid-state reaction method. The effect of Li, Ce composite iondoping on the ceramic structure and electrical properties was studied. The results show that, with increasing Li, Ce doping concentration, the crystal structure of CNBTNM-LC100x ceramics tends to transition from orthogonal to tetragonal, and the piezoelectric constant d₃₃ gradually increases. When the molar fraction x＞0.04, d₃₃ tends to decrease. When x=0.04, the ceramic sample exhibits the best comprehensive performance, with d₃₃≈15.9 pC/N, and the DC resistivity ρ≈5.9×10⁵ Ω·cmat 600 ℃.Further,the dielectric loss tan δ(1 MHz)≈7%,and T_C≈887 ℃.