摘要
ZrO_(2) spherical nanometer powders containing 3.5 mol%Y_(2)O_(3) have been prepared via the coupling route of water/oil(W/O)emulsion with dimethyl oxalate homogenous precipitation.ZrO_(2) powders and their precursor powders have been characterized by XRD,TEM and SEM.According to the XRD result,phase volume fractions of powders were calculated by comparing the peaks’intensities of spectrum.Furthermore,phase crystal lattice constants were obtained using crystal interplanar spacing formula and Bragg equation.With these results,the theoretical density of powders was analyzed.Finally,powders’spherical degree was revealed via the method of comparison between theoretical density and actual density.
基金
The authors acknowledge the support of the National Natural Science Foundation of China(Grant Nos.51004046 and 51075129)
the State Key Development Program for Basic Research of China(Project No.2010CB635107)
the National Natural Science Foundation of Hubei Province of China(Project No.2010CDB05806).
