In presence of EDTA and HEDP Blended, the Crystal Growth, Polymorphism, and Morphology of CaCO3 under Co2 Atmosphere

Abstract

Polymorphic compositions of CaCO3 synthesized under the influence of a blended system of EDTA and HEDP between 60, 80 ,100 °C using a controlled precipitation technique from CaCl2 solution using co2 gas from Inox  cylinder, has been investigated. The phases and structures of the samples were characterized by FTIR, and powder XRD techniques. The morphological studies were carried out using SEM, scanning electron microscope, . Usually, at higher temperatures vaterite and aragonite are transformed into stable calcite. Here, we report the stabilization of metastable aragonite and  least stable  vaterite in the presence of a blended system of EDTA and HEDP. .At 10ml and 20ml at 100c, We also report a novel morphology, rose like structure for vaterite ,(button rose) which is not reported earlier.