Energetics of nanocrystalline TiO 2
Top Cited Papers
- 30 April 2002
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 99 (suppl_2) , 6476-6481
- https://doi.org/10.1073/pnas.251534898
Abstract
The energetics of the TiO2 polymorphs (rutile, anatase, and brookite) were studied by high temperature oxide melt drop solution calorimetry. Relative to bulk rutile, bulk brookite is 0.71 ± 0.38 kJ/mol (6) and bulk anatase is 2.61 ± 0.41 kJ/mol higher in enthalpy. The surface enthalpies of rutile, brookite, and anatase are 2.2 ± 0.2 J/m2, 1.0 ± 0.2 J/m2, and 0.4 ± 0.1 J/m2, respectively. The closely balanced energetics directly confirm the crossover in stability of nanophase polymorphs inferred by Zhang and Banfield (7). An amorphous sample with surface area of 34,600 m2/mol is 24.25 ± 0.88 kJ/mol higher in enthalpy than bulk rutile.Keywords
This publication has 34 references indexed in Scilit:
- Thermochemistry of NanomaterialsReviews in Mineralogy and Geochemistry, 2001
- The Discovery and Study of Nanocrystalline TiO2-(MoO3) Core−Shell MaterialsJournal of the American Chemical Society, 2000
- Synthesis of brookite-type titanium oxide nano-crystals in organic mediaJournal of Materials Chemistry, 2000
- Micro-Raman Spectroscopic Characterization of Nanosized TiO2 Powders Prepared by Vapor HydrolysisJournal of Materials Research, 1998
- X-ray absorption of nanocrystal TiO2Nanostructured Materials, 1997
- Thermoanalytical characteristic of nanocrystalline brookite-based titanium dioxideNanostructured Materials, 1997
- Formation and Sintering of TiO2 (Anatase) Solid Solution in the System TiO2‐SiO2Journal of the American Ceramic Society, 1997
- Transformation Enthalpies of the TiO2 PolymorphsJournal of the American Ceramic Society, 1979
- Enthalpy of the Anatase‐Rutile TransformationJournal of the American Ceramic Society, 1967
- Phase transition of titanium dioxide under various pressuresJournal of the Less Common Metals, 1966