Abstract
Two kinds of solvents, Ca(NO 3) 2 and NH 4NO 3 solutions, were found to be very effective for growing calcite single crystals without contamination of metal ions such as Na + and K +. Spontaneously grown crystals with high transparency had a rhombohedral form bounded by (10 1 1) faces. NH 4NO 3 solvent gives great advantage in reduceing the growth temperature below 200°C. The character of crystals grown in Ca(NO 3) 2 and NH 4NO 3 solutions were compared with natural calcite crystals using FT-IR spectroscopy.
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