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Analysis of the miscibility of Cd2+ ions in CaCO3

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Abstract The study of the substitution of Ca2+ ions by Cd2+ ions in precipitated calcium carbonate is reported. The synthesizing route consists in precipitating CdxCa1−xCO3 particles by rapidly mixing CdCl2… Click to show full abstract

Abstract The study of the substitution of Ca2+ ions by Cd2+ ions in precipitated calcium carbonate is reported. The synthesizing route consists in precipitating CdxCa1−xCO3 particles by rapidly mixing CdCl2 and CaCl2 precursor solutions with Na2CO3 solution. We show experimentally that Cd2+ ions are completely miscible in CdxCa1−xCO3 for x = 0 to x = 1. One interesting point was to investigate whether the vaterite polymorph could be obtained during the precipitation of the initial precursors as it is the case for x = 0. We evidence that vaterite can be obtained only when x is less than 10%. Above this threshold, the calcite structure is the only polymorph observed. Yet, SEM experiments evidence that although the calcite structure is formed at x > 10%, a spheroidal morphology is nevertheless preserved in opposition to the classical rhombohedral one usually observed for calcite. We show by quantitative X-ray analysis that the size of the coherently scattering domains strongly decreases while the strain increases when x increases yielding CdCO3 scattering over a coherent size of about 100 nm.

Keywords: miscibility cd2; ions caco3; cd2 ions; analysis; analysis miscibility

Journal Title: Surfaces and Interfaces
Year Published: 2019

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