Synthesis and Metastabilization Mechanism of Tetragonal Pure Zirconia Powders Shen Zhijian;Fang Zhonghua;Li Tingkai;Ding ZishangTetragonal pure zirconia powders which can partially transform to monoclinic phase under stress inducement were prepared by controlling the final pH for precipitation of zirconia gel and the particle size. It is estimated that the transformation critical particle size of tetragonal pure zirconia powders is less then 180A,and the metastabilization of tetragonal pure zirconia powders is controlled both by the structure of zirconia gel precursor and the critical particle size.Zirconia;;Powder;;Transformation