王伟
,
吴顺华
,
孙萍
功能材料
以水合五氧化二钽(Ta2O5·nH2O)纳米胶粒为活性固相基体,柠檬酸镁、柠檬酸钡混合溶液为包覆相,采用液相包覆-界面反应的方法制备Ba(Mg1/3Ta2/3)O3超细粉体.利用热失重-差热分析、X射线衍射及透射电镜等手段对产物的合成过程与结构形态进行了分析表征.研究表明以该方法能够在800℃下合成出成分均一、纯度较高、具有良好烧结活性的BMT超细粉体,产物粒子的形态接近球形,粒径分布窄,大约为20～30nm.
关键词:
Ba(Mg1/3Ta2/3)O3
,
湿化学法
,
超细粉体
,
柠檬酸盐
Shunhua WU
,
Guoqing WANG
,
Shuang WANG
,
D
,
an LIU
材料科学技术（英）
The effect of Sn4+ (BaSnO3) B-site substitution on the microstructure and dielectric properties of Ba(Mg1/3Ta2/3O3 microwave ceramics was investigated. X-ray diffraction shows that a complex perovskite material Ba(Mg1/3Ta2/3)O3 was prepared. As Sn4+ content x increases in the (1-x) Ba(Mg1/3Ta2/3)O3-xBaSnO3 (x=0.00～0.20) system, the dielectric constant generally keeps unchanged, while TCF changes from positive to negative. Although the addition of Sn4+ reduces the ordering degree, Qf0 is still increased when the ceramics density increases. This trend implies that Qf0 of this system is mostly determined by ceramics density rather than ordering degree. After sintering at 1500℃ for 3 h, the system with x=0.15 was found to have excellent dielectric properties as follows: ε≈25, Qf0≥300,000 GHz at 7 GHz, TCF=-0.6×10-6℃.
关键词:
Ba(Mg1/3Ta2/3)O3
,
null
,
null
,
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