摘要
采用固相烧结法制备0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3陶瓷,并研究了ZBS (ZnO-B2O3-SiO2)掺杂对0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3陶瓷的相组成、致密度、微观形貌及微波介电性能的影响。结果表明,0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3+xZBS陶瓷中仅存在Li_2ZnTi_3O_8和Li_2TiO_3相。随着x的增加,其致密化温度逐渐降低,相对介电常数εr和品质因子Q·f均先增加后减小,谐振频率温度系数τ_f基本不变。当x为1%(质量分数)时,0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3+1%ZBS陶瓷在900℃烧结4 h后具有良好的微波介电性能:εr=25. 4,Q·f=88640 GHz,τ_f=-1×10~(-6)℃~(-1),且与Ag具有良好的化学相容性。
0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3 ceramics were prepared by the solid-state reaction method. The effects of ZBS (ZnO-B2O3-SiO2) doping on the phase composition,density,microstructure and microwave dielectric properties of 0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3 ceramics were investigated. The results show that 0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3+xZBS ceramics consist of Li_2ZnTi_3O_8 and Li_2TiO_3phases. With the increase of x,the densification temperature of ceramics decreases gradually,the relative permittivity εrand quality factor Q·f initially increase and then decrease,and the temperature coefficient of resonance frequency τ_f is stable. When x is 1% (mass fraction),the 0. 6Li_2ZnTi_3O_8-0. 4Li_2TiO_3+ 1% ZBS ceramic sintered at 900 ℃ for 4 h exhibits excellent microwave dielectric properties: εr= 25. 4,Q·f = 88640 GHz,τ_f=-1 × 10~(-6)℃~(-1). This ceramic also exhibits good chemical compatibility with Ag.
引文
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