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Growth faces morphology and defects of emerald crystals grown by seeded flux Techniqueстатья
Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
- Авторы: Barilo S.N., Bychkov G.L., Fedotova V.V., Kurnevich L.A., Shiryaev S.V., Leonyuk N.I., Smirnova T.V., Koyava V.T., Kuleshov N.V.
- Журнал: Journal of Crystal Growth
- Номер: part 1
- Год издания: 2000
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 716
- Последняя страница: 722
- DOI: 10.1016/S0022-0248(98)01134-8
- Аннотация: The problem of controlled crystallization of emerald single crystals from a fluxed melt, its colour characteristics and optic parameters are discussed. Properties of the as-grown single crystals are very much like those of natural gems. Emeralds weighting as much as 150 ct grown on oriented seeds in dynamical regime feature small dichroism, uniform distribution of colour in the volume to offer good jewelry characteristics. The (1 0 1̄ 0) and (1 1 2̄ 0) cuts of previously grown crystals is established to be the optimal seed. The technique has the advantage of maintaining the optimal concentration ratio of the solute near the crystallization front through adequate stirring by a platinum crystal holder is rotated at a rate of 30 rounds per minute, and seed positioning. To examine emerald crystals quality we have performed a laser experiment and threshold measurements. Lasing was achieved at absorbed pump energy threshold of less than 0.6 mJ.
- Добавил в систему: Леонюк Николай Иванович