EVALUATION OF SOLUTION COMBUSTION METHOD IN THE SYNTHESIS OF Fe-ZrSi04 BASED CORAL PIGMENT

Auto-ignited gel combustion process has been usedfor producing a red hematite-zirconbased pigment. the combustible mixtures contained the metal nitrates and citric acid as. oxi~izersandfuel, respectively. sodium silicate (water glass) was used as silica source for prod~clngzirconphase. x-ray diffractometery, electron microscopy and simultaneous thermal analysis were usedfor characterization of reactions happened in the resulted dried gel during its heat-treatment.l * a* b * color parameters were measured by the cie (commission international de i'eclairage)colorimetric method. this research has showed that solution combustion was unable to producecoral pigment as the end product of combustion without the need for any further heat treatmentprocess.