Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 20 October 1967:
Vol. 158. no. 3799, pp. 388 - 389
DOI: 10.1126/science.158.3799.388
Prev | Table of Contents | Next

Articles

Enthalpy of Transformation of a High-Pressure Polymorph of Titanium Dioxide to the Rutile Modification

Alexandra Navrotsky 1, John C. Jamieson 1, and Ole J. Kleppa 1

1 James Franck Institute and Department of Geophysical Sciences, University of Chicago, Chicago, Illinois

The enthalpy of transformation of a high-pressure form of titanium dioxide, which has the alpha lead dioxide structure, to the rutile modification was measured by the method of "transposed temperature-drop calorimetry." For the reaction, titanium dioxide (alpha lead dioxide form) transforming to rutile, the change in the heat content is -0.76 ± 0.17 kilocalorie per mole. From this value and the volume change (+ 2.8 percent) associated with the transformation, we estimate the equilibrium pressure at 294°K to be 60 ± 20 kilobars.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Correlating Nanoscale Titania Structure with Toxicity: A Cytotoxicity and Inflammatory Response Study with Human Dermal Fibroblasts and Human Lung Epithelial Cells.
C. M. Sayes, R. Wahi, P. A. Kurian, Y. Liu, J. L. West, K. D. Ausman, D. B. Warheit, and V. L. Colvin (2006)
Toxicol. Sci. 92, 174-185
   Abstract »    Full Text »    PDF »
High-Pressure Polymorphism of Titanium Dioxide.
J. C. Jamieson, J. C. Jamieson, and B. Olinger (1968)
Science 161, 893-895
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)