Production of sapphire tubes for high-pressure sodium lamps using the stepanov method at high rates of growth

Autor:	T. A. Steriopolo, V. A. Borodin, L. I. Chernyshova, V. A. Tatarchenko, T. N. Yalovets
Rok vydání:	1985
Předmět:	Chemistry Analytical chemistry Crucible chemistry.chemical_element General Chemistry Condensed Matter Physics medicine.disease Oxygen law.invention Crystallography law medicine Sapphire General Materials Science Graphite Crystallization Carbon Vapours Solid solution
Zdroj:	Crystal Research and Technology. 20:159-166
ISSN:	1521-4079 0232-1300
DOI:	10.1002/crat.2170200208
Popis:	The process of the Stepanov growth of sapphire tubes is studied at the growth rates up to 20 mm · min−1 in a Mo crucible with graphite succeptor. It is established that the main factor preventing the production of high-quality samples is contamination of the melt due to the gas transport reactions the growth chamber atmosphere and formation of oversaturated carbon solid solution in the Al2O3 matrix. The decomposition of this solid solution gives rise to the second-phase-particle precipitations. The production of highquality sapphire tubes at the growth rates up to 20 mm · min−1 is possible with a careful elimination of water vapours and oxygen from the growth chamber atmosphere. [Russian Text Ignored]
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::00ab68f8c4b1dee18fbd210035faa504 https://doi.org/10.1002/crat.2170200208 Zobrazit plný text záznamu Plný text