Study on gaseous impurities in alpha-alumina, used single crystals growing
The optimal condition of water content determination in α-AI₂О₃, including sample mixing with methanol followed by titration of the suspension with K.Fisher reagent in the presence of methylene-blue background dye have been found. We have proved the absence of any significant systematic errors by va...
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| Datum: | 2005 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
НТК «Інститут монокристалів» НАН України
2005
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| Schriftenreihe: | Functional Materials |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/138858 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Study on gaseous impurities in alpha-alumina, used single crystals growing / T.A. Blank, L.P. Eksperiandova, L.I. Gorodilova, V.D. Panikarskaya, K.A. Kudin // Functional Materials. — 2005. — Т. 12, № 3. — С. 600-603. — Бібліогр.: 3 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | The optimal condition of water content determination in α-AI₂О₃, including sample mixing with methanol followed by titration of the suspension with K.Fisher reagent in the presence of methylene-blue background dye have been found. We have proved the absence of any significant systematic errors by variation of weighed. The determination limit, corresponding to standard deviation of single result 0.3, of the methodic developed is 9•10⁻² mass %. Thermogravimetric and mass-spectrometric data show that α-AI₂О₃ contains not only water, but also significant amounts of СО and СО₂, which, apparently, is the main reason of blowhole-like defects in those single crystals. We assume that material degassing by heating it in vacuum can allow a more effective elimination of such defects in the crystals, than the widely used thermal treatment of the material at atmospheric pressure. |
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