摘要
以乙酸钡为钡源、乙酸锶为锶源、钛酸丁酯为钛源、丙三醇为溶剂,通过非水解溶胶-凝胶法合成Ba1-xSrxTiO3粉体.借用XRD、SEM等测试手段,系统探讨了 Ba∶Sr∶Ti比对Ba1-xSrxTiO3粉体合成的影响,并研究了Ba0.6Sr0.4TiO3粉体的烧结性能.结果表明:当 Ba∶Sr∶Ti比分别为 0.5∶0.5∶1.2、0.6∶0.4∶1.2、0.7∶0.3∶1.3和 0.8∶0.2∶1.4 时,可制得 Ba0.5Sr0.5TiO3、Ba0.6Sr0.4TiO3、Ba0.7Sr0.3TiO3、Ba0.8Sr0.2TiO3 的纯相粉体.随着锶含量的逐渐减少,Ba1-xSrxTiO3的衍射峰强度是逐渐减弱的,表明锶的取代降低了 Ba1-xSrxTiO3的结晶度.根据XRD精修结果,发现Ba1-xSrxTiO3粉体中随着锶含量的增多,晶格常数和晶胞体积均减少,Ba-O键和Ti-O键键长也均减少.优选添加分散剂吐温60改善了粉体的分散性,获得了一次粒径约为50 nm,D50为0.366 μm的钛酸锶钡超细粉体.
Abstract
In this paper,Ba1-xSrxTiO3 powder was synthesized by a nonhydrolytic sol-gel method using barium acetate as barium source,strontium acetate as strontium source,butyl titanate as titanium source and glycerol as solvent.Employing testing methods such as XRD and SEM,the influence of the Ba∶Sr∶Ti ratio on the synthesis of Ba1-xSrxTiO3 powder was systematically investigated,and the sintering performance of Ba0.6Sr0.4TiO3 powder was also studied.The results showed that pure phase powders of Ba0.5Sr0.5TiO3,Ba0.6Sr0.4TiO3,Ba0.7Sr0.3TiO3,and Ba0.8Sr0.2TiO3 could be prepared when the Ba∶Sr∶Ti ratios were 0.5∶0.5∶1.2,0.6∶0.4∶1.2,0.7∶0.3∶1.3,and 0.8∶0.2∶1.4,respectively.As the strontium content gradually decreases,the diffraction peak intensity of Ba1-xSrxTiO3 gradually weakens,indicating that the substitution of strontium reduces the crystallinity of Ba1-xSrxTiO3.According to the XRD refinement results,it was found that with the increase of strontium content in Ba1-xSrxTiO3 powder,both the lattice constant and cell volume decreased,and Ba-O and Ti-O bonds length also decreased.The optimal addition of dispersant Tween 60 improves the dispersion of the powders,resulting in ultrafine barium strontium titanate powders with the original particle size of about 50 nm and D50 of 0.366 μm are finally obtained.
基金项目
国家自然科学基金(52262003 52072162)
国家自然科学基金(51962014)
江西省科技计划项目(20202ACBL241006)
江西省科技计划项目(20202ACBL241008)
江西省教育厅项目(GJJ211308)
景德镇科技计划项目(20202GYZD013-014)
景德镇科技计划项目(20224GY008-07)
景德镇陶瓷大学大学生创新创业训练计划项目(202210408009)
NETL
NSTL
万方数据