低温-低压水热合成纳米Ba1-xZnxTi1-yCeyO3介电材料及其结构、性能研究

采用低温-低压水热技术,在150℃,0.5 MPa以下合成了一系列Ba1-xZnxTi1-yCeyO3固溶体纳米粉末(0≤x≤0.3,0≤v≤0.3),XRD物相分析和d-间距-组成图证明,产品为立方晶系的完全互溶取代固溶体,结果符合Vegard定律.TEM形貌观察,粒子为均匀球形,平均粒径70 nm.通过制陶实验,分别测定了该系列固溶体的室温介电常数、介电损失以及介电常数随温度的变化,结果发现,通过低温-低压液相反应在BaTiO3中掺入适量锌和铈,由于掺杂离子均匀进入母体晶格,引起t,降低,室温介电常数达18 000以上.纳米粉体的烧结温度为1 200℃,比传统微米级粉体的烧结温度降低150～200℃

Hydrothermal Synthesis, Structure and Dielectric Property of Ba1 - xZnxTi1- yCeyO3

A series of Ba 1- x Zn x Ti 1- y Ce y O 3(0≤ x , y ≤0.3) solid solutions were synthesized by low -temperature/ low-pressure hydrothermal method below 150 ℃,0.5 MPa.XRD and cell parameters-component figures of the series of the solid solutions powder demonstrated that the compounds are mutually miscible in the solid solutions. Furthermore, there is conducted an observation through a TEM, the product is found to have a shape of uniform, substantially spherical particles with an average particle size of 70 nm in diameter. The results of preparing ceramics showed that after adulterating with Zn 2+ and Ce 4+ in pure BaTiO 3 phase, the dielectric constant increased ten times at room temperature.