摘要
采用传统固相法制备复合钙钛矿型Ba[(Co_(1-x)Mg_x)_(1/3)Nb_(2/3)]O_3(0.0≤x≤0.4)微波陶瓷。通过介电性能测试,结合X射线衍射仪、拉曼光谱、透射电镜等表征手段,系统研究Mg掺杂对Ba(Co_(1/3)Nb_(2/3))O_3微波陶瓷的B位1:2有序度与性能的影响。结果表明,Mg掺杂能显著提高Ba(Co_(1/3)Nb_(2/3))O_3陶瓷的B位1:2有序度,进而提高材料的品质因子。1 420℃下烧结的掺杂量x=0.2的陶瓷有序度最高,在1 300℃退火24 h后,其B位1:2有序度进一步提高,并且第二相得以消除,获得与传统Ta基复合钙钛矿微波陶瓷相当的微波性能:介电常数ε_r=30.94,品质因子Q·f=63 161 GHz,谐振频率温度系数τ_f=4.1 ppm/℃。
Ba[（Co1？xMgx）1/3Nb2/3]O3（0.0≤x≤0.4） microwave ceramics were prepared by the conventional solid reaction method. The relationship between the B site 1：2 ordering and microwave dielectric properties of Mg-doped Ba（Co1/3Nb2/3）O3 microwave ceramics were clarified using dielectric performance test XRD, Raman and TEM. The results show that the Q·f of Mg-doped Ba（Co1/3Nb2/3）O3 ceramics is increased because the B site 1：2 ordering degree is enhanced. The highest ordering degree of the ceramics doped with x=0.2 is obtained at 1 420 ℃. After annealing at 1 300 ℃ for 24 h, the ordering degree of 1：2 in B site is further improved, and the second phase is eliminated. Microwave properties with εr=30.94, Q·f=63 161 GHz, τf =4.1 ppm/℃ comparable to those of conventional Ta based composites perovskite microwave ceramics are obtained.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第1期78-84,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家科学自然基金资助项目(51172053)
关键词
微波陶瓷
钙钛矿
掺杂
有序–无序转变
微波性能
microwave ceramics
perovskite
doping
order-disorder transition
microwave properties
