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Science 17 September 1976:
Vol. 193. no. 4258, pp. 1121 - 1122
DOI: 10.1126/science.193.4258.1121
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Articles

Density Maxima in High-Pressure Supercooled Water and Liquid Silicon Dioxide

C. A. ANGELL 1 and H. KANNO 1

1 Department of Chemistry, Purdue University, Lafayette, Indiana 47907

With glass capillary pressure vessels it has been possible to study the effect of pressure on the temperature of maximum density (TMD) and on the "sharpness" of the density maximum in liquid H2O and D2O in the important but little-studied supercooled regime. A pressure of 1200 bars produces a 33°C depression of the TMD in these liquids and a considerable reduction in sharpness. Comparison with the rather flat density maximum for liquid SiO2 supports the notion that the presence or absence of density anomalies in "tetrahèdral" liquids depends on the average bridge-bond angle, which is evidently unusually large in water at normal pressure.

Submitted on March 16, 1976
Revised on July 12, 1976


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
From the Cover: Observation of the density minimum in deeply supercooled confined water.
D. Liu, Y. Zhang, C.-C. Chen, C.-Y. Mou, P. H. Poole, and S.-H. Chen (2007)
PNAS 104, 9570-9574
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Pressure Enhancement of Ion Mobilities in Liquid Silicates from Computer Simulation Studies to 800 Kilobars.
C. A. ANGELL, P. A. CHEESEMAN, and S. TAMADDON (1982)
Science 218, 885-887
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