Abstract
IT has already been found that calcium carbonate exists in one stable form, β-CaCO3 (calcite), and two unstable forms, λ-CaCO3 (aragonite) and μ-CaCO3 (or vaterite), in the ordinary temperature range. Aragonite is formed if precipitation is carried out at a temperature approaching the boiling point of water (higher than 85° C.), whereas when precipitation is carried out at room temperature only calcite results. The third form of calcium carbonate, μ-CaCO3, is formed by precipitation at 60° C.1. Barium carbonate and strontium carbonate have only one stable form (aragonite-type structure) and in both cases temperature of precipitation has no effect on crystal form.
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References
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TERADA, J. Crystal Structure of Barium–Strontium–Calcium Triple Carbonate. Nature 171, 517–518 (1953). https://doi.org/10.1038/171517b0
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DOI: https://doi.org/10.1038/171517b0
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