Energetics of nanocrystalline TiO <sub>2</sub>-Reference-Cited by-同舟云学术

Energetics of nanocrystalline TiO ₂

Published:2002-04-30 Issue:suppl_2 Volume:99 Page:6476-6481
ISSN:0027-8424
Container-title:Proceedings of the National Academy of Sciences
language:en
Short-container-title:Proc. Natl. Acad. Sci. U.S.A.

Author:

Ranade M. R.¹,Navrotsky A.¹,Zhang H. Z.¹,Banfield J. F.¹,Elder S. H.¹,Zaban A.¹,Borse P. H.¹,Kulkarni S. K.¹,Doran G. S.¹,Whitfield H. J.¹

Affiliation:

1. University of California, Department of Chemical Engineering and Materials Science, Thermochemistry Facility, Davis, CA 95616; University of Wisconsin, Department of Geology and Geophysics, Madison, WI 53706; Intel Corporation, Hillsboro, OR 97124; Bar-Ilan University, Department of Chemistry, Ramat-Gan 52900, Israel; University of Pune, Department of Physics, Pune 411007, India; CSIRO Manufacturing Science and Technology Clayton, Victoria 3169, Australia; and Department of Applied Physics, Royal...

Abstract

The energetics of the TiO 2 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/m 2 , 1.0 ± 0.2 J/m 2 , and 0.4 ± 0.1 J/m 2 , 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 m 2 /mol is 24.25 ± 0.88 kJ/mol higher in enthalpy than bulk rutile.

Publisher

Proceedings of the National Academy of Sciences

Link

https://pnas.org/doi/pdf/10.1073/pnas.251534898

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