Structural models for intergrowth structures in the phase system Al2O3–TiO2

✍ Scribed by Stefan Hoffmann; Stefan T. Norberg; Masahiro Yoshimura

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 528 KB
• Volume: 178
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2005.07.001

✦ Synopsis

The phase system Al 2 O 3 -TiO 2 was investigated in the compositional range from 48:52 to 62:38 mol% Al 2 O 3 :TiO 2 . The samples were prepared by melting the binary oxides in an arc-imaging furnace and the obtained samples were examined by powder X-ray diffraction. The recorded powder patterns could be interpreted in terms of intergrowth structures consisting of two basic building blocks, which were deduced from the known crystal structures of b-Al 2 TiO 5 and Al 6 Ti 2 O 13 . The structure of a new ordered compound with the formula Al 16 Ti 5 O 34 is proposed. The thermal stability was estimated from DTA and tempering experiments and showed that all prepared samples decompose at temperatures around 800 1C into the binary oxides corundum and titania.