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Hydrothermal Synthesis of Chrysoberyl (Hydrothermalsynthese von Chrysoberyll).

PB188097T

Publication Date	1969
Personal Author	Rykl, D.; Bauer, J.
Page Count	20
Abstract	Chrysoberyl was prepared by hydrothermal synthesis from a mixture of BeO and Al2O3. As solvent the NaOH solution of a concentration from 5 to 25 percent by weight was applied in the temperature range from 450 to 590C and a pressure from approximately 600 to 650 at. Also the recrystallization of synthetic microcrystalline chrysoberyl in the NaOH solutions on hydrothermal conditions has been verified. The use of Na2B4O7, H3BO3, and NaHCO3 solutions on given conditions seems to be ineffective for the transport mechanism. Pure chrysoberyl was grown only from 5% and 10% NaOH solutions at 590C, the attained size of the crystals was 0.5 mm. From 10% and 20% NaOH solutions at 450C only the bromelite (BeO) crystallized. The morphology of chrysoberyl crystals seems to be influenced more by the temperature gradient than by the used concentration of the NaOH solutions. (Author)
Keywords	Minerals Crystal growth Synthesis(Chemistry) Beryllium oxides Alumina Hydroxides Solvents Phase studies Crystallization East Germany Chrysoberyl Translations
NTIS Subject Category	46D - Solid State Physics 48F - Geology & Geophysics 99F - Physical & Theoretical Chemistry
Corporate Authors	California Univ., Berkeley. Lawrence Radiation Lab.
Supplemental Notes	Trans. of Kristall und Technik (East Germany) v3 n3 p361-373 1968, by B. Hazzard.
Document Type	Technical Report
NTIS Issue Number	197003

Hydrothermal Synthesis of Chrysoberyl (Hydrothermalsynthese von Chrysoberyll).

Hydrothermal Synthesis of Chrysoberyl (Hydrothermalsynthese von Chrysoberyll).
PB188097T

Publication Date	1969
Personal Author	Rykl, D.; Bauer, J.
Page Count	20
Abstract	Chrysoberyl was prepared by hydrothermal synthesis from a mixture of BeO and Al2O3. As solvent the NaOH solution of a concentration from 5 to 25 percent by weight was applied in the temperature range from 450 to 590C and a pressure from approximately 600 to 650 at. Also the recrystallization of synthetic microcrystalline chrysoberyl in the NaOH solutions on hydrothermal conditions has been verified. The use of Na2B4O7, H3BO3, and NaHCO3 solutions on given conditions seems to be ineffective for the transport mechanism. Pure chrysoberyl was grown only from 5% and 10% NaOH solutions at 590C, the attained size of the crystals was 0.5 mm. From 10% and 20% NaOH solutions at 450C only the bromelite (BeO) crystallized. The morphology of chrysoberyl crystals seems to be influenced more by the temperature gradient than by the used concentration of the NaOH solutions. (Author)
Keywords	Minerals Crystal growth Synthesis(Chemistry) Beryllium oxides Alumina Hydroxides Solvents Phase studies Crystallization East Germany Chrysoberyl Translations
NTIS Subject Category	46D - Solid State Physics 48F - Geology & Geophysics 99F - Physical & Theoretical Chemistry
Corporate Authors	California Univ., Berkeley. Lawrence Radiation Lab.
Supplemental Notes	Trans. of Kristall und Technik (East Germany) v3 n3 p361-373 1968, by B. Hazzard.
Document Type	Technical Report
NTIS Issue Number	197003