A SEM EDX STUDY OF THE COBALT DISTRIBUTION IN COAPO-TYPE MATERIALS/

Several CoAPO-type materials were obtained by hydrothermal crystalliza tion of gels containing triethylamine as template and variable amounts of cobalt. The nature and crystal morphology of the several crystalli ne phases were found to depend on the cobalt content of the gel and th e crystallization time. AFl and CHA topologies and unidentified phases were obtained. Microprobe analysis coupled with SEM showed a heteroge neous distribution of cobalt in the crystallites corresponding to the different crystalline phases. The cobalt content in AFl was found to b e higher than previously reported in the literature; its incorporation probably took place in an early stage of the crystallization process.