摘要
采用溶胶 -凝胶法制备 BTN前躯体 ,用 XRD、IR和 TEM等方法对粉体的结构和形貌进行了表征 ,采用等静压工艺将粉体成型 ,进行常压烧结 .结果表明 ,粉体含有的团聚较少 ,粒径在 3 0 nm左右 .至 80 0℃时 ,晶体结构已经完全形成 ,主晶相为 Nd2 Ti2 O7.与固相法相比 ,其成瓷范围宽 (1 2 70～ 1 41 0℃ ) ,介电常数 (ε)稳定 ,介质损耗 (tgδ)小 .
BaO TiO 2 Nd 2O 3(BTN) precursor was prepared by sol gel method. Its morphology and structure were characterized by XRD?IR and TEM. BTN powders were sintered and moulded to be ceramic material. The results indicated that the grain had a diameter of 30 nm, with a few agglomerations. The compound crystallized completely at 800 ℃, and the main crystal phase was Nd 2Ti 2O 7. Compared with solid phase method, the material could be moulded at wider range of temperature(1 270～1 410 ℃), with steady dielectric constant( ε ) and small dielectric loss(tg δ ).
出处
《应用化学》
CAS
CSCD
北大核心
2002年第2期126-129,共4页
Chinese Journal of Applied Chemistry
基金
电子工业部军工资助项目 ( 0 0 0 5 ZM0 0 17)
