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Co-precipitation of Calcium Carbonate and Barium Carbonate at High Temperature

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Abstract

Ammonium carbonate solution was added into a solution of calcium and barium maintained at 90°C, and a carbonate precipitate was produced. Co-precipitation of calcium carbonate and barium carbonate was investigated analytically. The calcium and barium carbonates produced at high temperature were both composed of rod-shaped particles and their crystals belonged to the orthorhombic system. The co-precipitated particles of calcium and barium carbonates were generally composed of two kinds of crystals: a spindle-shaped crystal and a cubic-like plate crystal. The spindle-shaped and cubic-like crystals were both solid solutions of calcium and barium carbonates. The precipitate produced in an equimolecular solution of calcium and barium was composed of only cubic-like plate crystals. These belonged to the orthorhombic system; their lattice constants were estimated to be a0=5.06, b0=8.80 and c0=6.24. The lattice constants of these spindle-shaped and cubic-like crystals were estimated on the assumption that all the crystals belonged to the orthorhombic system.

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Yokofujita, K., Ishii, Y. & Takiyama, K. Co-precipitation of Calcium Carbonate and Barium Carbonate at High Temperature. ANAL. SCI. 1, 37–39 (1985). https://doi.org/10.2116/analsci.1.37

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  • DOI: https://doi.org/10.2116/analsci.1.37

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