作　　者： ; ;

机构地区： 南昌大学

出　　处： 《化学学报》 1998年第8期780-784,共5页

摘　　要： 研究了纳晶氧化物Dy_(1-x)Sr_xCoO_(3-x)(x=0.6)的等温烧结动力学,计算了烧结激活能,结果表明:在烧结初期,致密化机制主要为蒸发-凝聚传质;在烧结中期,致密化机制转为晶界控制.烧结过程的激活能为5.255×10~4J·mol^(-1).较小的激活能体现了纳米粒子的尺寸效应.快速运动的晶界,导致晶界与气孔的运动速度不匹配,造成纳晶氧化物密度低,最终形成纳米海绵态网络结构. The isothermal sintering kinetics of nanocrystalline Dy1-xSrxCoO3-y(x=0.6) were studied, and the sintering activation energy was calculated. The results show that the main densification mechanism is evaporation-condensation mechanism and grain boundaries control mechanismin during the initial and middle sintering stage respectively. The sintering activation energy of Dy1-xSrxCoO3-y is 5.255×104 J·mol-1. It appeared as nanometer size effect. The grain boundaries with fast moving resulted in dismatching between grain boundaries and pores moving velocity and the density of nanocrystalline oxides was low. Finally, it formed network structure nanometer sponge state.

关 键 词： 纳米晶 烧结动力学 镝 锶 钴 稀土 复合氧化物

领　　域： [理学] [理学] [理学] [理学]