Pore-structure stability of nanostructured rutile titania containing a ``structure-directing second-phase stabilizer``
- National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (Japan)
- Univ. of Tokyo (Japan). Dept. of Chemical System Engineering
Metastable-to-stable transformation in oxides is always associated with a drastic reduction in surface area and/or porosity. Because of this, all earlier efforts to stabilize the pore-structure of oxides undergoing a metastable-to-stable phase transformation have been directed to retarding or preventing the transformation. Here the authors report the pore-structure stabilization of nanostructured titania by promoting the anatase-to-rutile transformation using a structure-directing second-phase stabilizer. In the present study pure titania transformed to more than 95% rutile and became completely dense at 800C (near zero porosity), whereas titania containing 2.4 mol% tin oxide transformed to about 70% rutile already at 750 C, but retained a surface area as high as 16 m{sup 2}/g. At 800 C it transformed to 100% rutile and still retained a surface area of about 8 m{sup 2}/g.
- OSTI ID:
- 655381
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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