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Science 30 August 1968:
Vol. 161. no. 3844, pp. 893 - 895
DOI: 10.1126/science.161.3844.893
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Articles

High-Pressure Polymorphism of Titanium Dioxide

John C. Jamieson 1 and Bart Olinger 1

1 Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637

X-ray diffraction studies made in situ under conditions of high pressure and high temperature revealed the direct transition of rutile to the alpha lead dioxide form in titanium dioxide. Compressibility studies of this alpha lead dioxide form at room temperature showed anomalous behavior in that its molar volume converges close to, but not equal to, that of the rutile form. Under this circumstance an unexpectedly large error appears in the calculations of the equilibrium pressure for the two forms at 298°K.


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