Growth of emerald crystals from PbO · V2O5 flux |
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Authors: | Shuji Oishi Minoru Hirao |
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Affiliation: | (1) Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, Wakasato, 380 Nagano, Japan |
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Abstract: | The flux growth of emerald crystals by slow cooling in the PbO · V2O5 flux is reported. The crystals exhibited the typical emerald-green colour, were up to 1.8 mm in size and transparent. Their
form was a regular hexagonal rod bounded by the well-developed {0001} and {10ˉ10} faces. The solubility of emerald in PbO
· V2O5 was also investigated; about 9.0 g emerald was dissolved in 100 g PbO · V2O5 at 1200 °C. The solubility decreased gradually with decreasing temperature. Taking the solubility data into account, the
presence of undissolved particles in the solution was found to be a necessary condition for the growth of large emerald crystals.
Unsaturated solution at a soak temperature produced good and relatively small emerald crystals in a subsequent cooling experiment.
Advantages of the PbO · V2O5 flux are also mentioned. Emerald crystals showing various kinds of imperfections, and even good crystals, were also present. |
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