For CL10.0, the intensities
of CaO peaks was reduced together with crystallites phases
of La2O3,which imply that some of the La3þ and excess of Ca2þ
do not precipitate completely during co-precipitation process.
The surface and bulk composition of Ca/La atomic ratio was
determined by EDS and ICP-AES analysis (Table 2). The results
showed that experimental surface atomic molar ratio of CaOeLa2O3