Abstract
Quantitative analysis by data refinement of the Rietveld method for calcium-based catalyst samples from hermit crabs (Paguroidea) ash has been successfully carried out. The results of the improvement showed that the samples of hermit crab shell calcined at 900 ° C gave different phase compositions and unit cell parameters due to the influence of calcination times 2, 3 and 4 hours. 2 hours is a single phase CaCO3 calcite, 3 hours are multiphase CaCO3 calcite and CaO, while a 4 hour sample is a single phase CaO . The reliability value (R) of the improvement results, R P , R wp , R exp and GoF = χ 2 gives good and acceptable results
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