低温固态反应制备纳米Ba_(1-y)Sr_yTi_(1-x)Zr_xO_3介电材料及性能研究

将TiCl4的水解产物与固体Ba(OH)2按摩尔比1∶1混合,混合物经室温研磨、100℃烘干,得到钛酸钡纳米晶;按相同工艺掺杂,合成了一系列Ba1-ySryTi1-xZrxO3(0x≤0.3,0y≤0.4)固溶体;采用X射线衍射分析了产物的晶体结构,采用透射电镜观察了其形貌;并测定了系列固溶体的室温介电常数、介电损失.结果表明,所制备的Ba1-ySryTi1-xZrxO3为完全互溶取代固溶体,由平均粒径70 nm的球形微粒组成.经低温固态反应掺入适量锆、锶后,BaTi O3的室温介电常数由3 000提高到20 000左右.

Preparation and Dielectric Performance of Ba1-ySryTi1-xZrxO3 Synthesized by Solid-State Reaction at Low Temperature

The hydrolysis product of TiCl4 was mixed with Ba（OH）2 at a molar ratio of 1∶1,followed by grinding at room temperature and drying at 100 ℃,generating barium titanate（BaTiO3） nanocrystalline.The same procedures were used to prepare a series of doped Ba1-ySryTi1-xZrxO3（0x≤0.3,0y≤0.4） solid solution via solid-state reaction at low temperature.The crystal structure of the products was analyzed by means of X-ray diffraction,and their morphology was observed using a transmission electron microscope.Moreover,room-temperature dielectric constant and dielectric loss of the solid solutions were measured.Results indicate that the solid solution products are completely mutually miscible and replaceable,and consist of spherical grains with an average size of 70 nm.After being doped with a proper amount of Zr and Sr via solid-state reaction at low temperature,doped BaTiO3 has a room-temperature dielectric constant of about 20 000,much larger than 3 000,that of undoped BaTiO3.