Zirconia aerogels, which process good nano-network structure, were prepared by hydrothermal-gel
method using zirconium oxynitrate as precursor and carbamide as gelation accelerator,followed by supercritical fluid
drying. The structure of the porous zirconia aerogels was investigated by the measurement of pore size distribution,
TEM, BET,and XRD. The results show that the as-prepared zirconia aerogels with a high specific surface area of 445
m2 / g consist of the amorphous and tetragonal phase. The pore size distributions of as-prepared aerogels have two significant
maxima:5 to 7 nm and 30 to 40 nm.