【摘要】 研究了Zr和Ti复合取代Ca[(Li1/3Nb2/3)0.95Zr0.15-xTix]O3+δ(0≤x≤0.15,CLNZT)陶瓷B位对其晶体结构及微波介电性能的影响,并分析了谐振频率温度系数τf随容忍因子t的变化关系。当0≤x≤0.15时,CLNZT陶瓷为单一斜方钙钛矿相,随x的增加,τf由–9.4×10–6/℃变为–15.8×10–6/℃,而品质因数与谐振频率乘积Q·f值先增大,x=0.10时又开始下降。当x=0.10时,陶瓷具有较好的微波介电性能:εr为32.8,Q·f值为1.66×104GHz,τf为–13.6×10–6/℃。更多还原

【Abstract】 The effects of Zr and Ti co-substitution in B site on the crystal structures and microwave dielectric properties of Ca[(Li1/3Nb2/3)0.95Zr0.15–xTix]O3+δ (0≤x≤0.15, CLNZT) ceramics were investigated, and the changing relation between temperature coefficient of resonance frequency (τf) and tolerance factor (t) was discussed. CLNZT ceramics possess a single orthorhombic perovskite phase at x = 0~0.15. With an increase of x, the value of τf varies from –9.4×10–6 /℃ to –15.8×10-6/℃, However, the product of quality factor and resonance frequency (Q·f ) values increases firstly, and then begins to decrease at x = 0.10. When x = 0.10, CLNZT ceramics have better microwave dielectric properties: εr = 32.8, Q·f = 1.66×104 GHz and τf =-13.6×10-6 /℃.更多还原