反应温度和升温速度对氧化锆相转变的影响

利用液相沉淀方法制备了未掺杂、氧化钇掺杂和氧化钐掺杂的纳米级氧化锆粉体.实验结果表明,高的反应温度和煅烧过程中快的升温速度明显增加了前驱体溶液中单斜氧化锆的形核数.实验和密度泛函计算结果分析认为,高的反应温度和快的升温速度均是通过降低氧化锆前驱体网状结构的有序度来影响最终的氧化锆晶型.

Effect of Reaction Temperature and Ascending Temperature Speed on the Phase Transformation of Zirconia

The pure, Y2O3-doped and Sm2O3-doped nanozirconia powders were prepared by the precipitation method. Experimental results indicate that a high reaction temperature and quickly ascending temperature speed apparently increase the nucleation number of monoclinic zirconia in the precursor solution. The present experimental results and density functional theoretical analyses indicate that the effect of high reaction temperature and quickly ascending temperature speed on the final crystalline phases of zirconia comes from the decrease of ordered degree of the net-like zirconia precursor structure.