Solid-state diffusive amorphization in TiO{sub 2}/ZrO{sub 2} bilayers
- Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering
Thin films of crystalline TiO{sub 2} were deposited on self-assembled organic monolayers from aqueous TiCl{sub 4} solutions at 80 C; partially crystalline ZrO{sub 2} films were deposited on top of the TiO{sub 2} layers from Zr(SO{sub 4}){sub 2} solutions at 70 C. In the absence of a ZrO{sub 2} film, the TiO{sub 2} films had the anatase structure and underwent grain coarsening on annealing at temperatures up to 800 C; in the absence of a TiO{sub 2} film, the ZrO{sub 2} films crystallized to the tetragonal polymorph at 500 C. However, the TiO{sub 2} and ZrO{sub 2} bilayers underwent solid-state diffusive amorphization at 500 C, and ZrTiO{sub 4} crystallization could be observed only at temperatures of 550 C or higher. This result implies that metastable amorphous ZrTiO{sub 4} is energetically favorable compared to two-phase mixtures of crystalline TiO{sub 2} and ZrO{sub 2}, but that crystallization of ZrTiO{sub 4} involves a high activation barrier.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 282223
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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