柠檬酸-硝酸盐燃烧法制备Ba_(0.5)Sr_(0.5)TiO_3介电材料

Ba_(0.5)Sr_(0.5)TiO_3 Dielectric Materials Prepared by Citrate-nitrate Combustion

以硝酸钡、硝酸锶,钛酸四丁脂以及氨水为原料,利用柠檬酸-硝酸盐燃烧法制备了Ba_(0.5)Sr_(0.5)TiO_3(BST)超细粉末。详细研究了pH值、分散剂对形成BST粉末粒度的影响.用所合成的粉末压片,1300℃烧结2h即可获得致密烧结体,烧结样品的平均粒径约为1μm.在10kHz,25℃下的介电性能为:介电常数1470,介电损耗0.006。

Ultra-fine Ba0.5Sr0.5TiO3 (BST) powder was prepared by using barium nitrate, strontium nitrate, tetra-n-butyl titanate, and ammonium hydroxide via citrate-nitrate combustion process. The pH value and dispersant, strongly influencing on the particle distribution of BST powder, were investigated in detail. The precursor powders were pressed into tablets (phi=20.0mm, d=5.0 mm)and then fully sintered at 1300degreesC for 2h. At 25degreesC, the dielectric constant and dissipation factor of the sintered sample were 1470 and 0.006 at 1OkHz, respectively, measured by a HP4192A Impedance.