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Transformation of spinel crystals structure МgО·nАІ₂O₃ under high-temperature annealing
The processes at high temperature annealing of non-stoichiometric МgО·nАІ₂O₃ spinel crystals (n = 2.2) in O₂ atmosphere at 1300-1500°C have been investigated. A gradual non-stoichiometry increase up to n = 2.8 has been found with increasing annealing time due to MgO evaporation followed by formation...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
НТК «Інститут монокристалів» НАН України
2009
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| Series: | Functional Materials |
| Subjects: | |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/138903 |
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| Summary: | The processes at high temperature annealing of non-stoichiometric МgО·nАІ₂O₃ spinel crystals (n = 2.2) in O₂ atmosphere at 1300-1500°C have been investigated. A gradual non-stoichiometry increase up to n = 2.8 has been found with increasing annealing time due to MgO evaporation followed by formation of polycrystalline α-АІ₂O₃ phase. The structure and composition МgО·nАІ₂O₃ layer grown at the sapphire surface in MgO vapor of at 1500-1800°C have been studied. The formation of amorphous phase in transition zone from hexagonal sapphire structure with a piling sequence ABABAB into spinel cubic one with sequence of atomic layers ABCABC was established. |
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