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Metastable Melting Lines for H2O and the Liquid-Liquid Phase Transition Hypothesis

Published online by Cambridge University Press:  10 February 2011

Osamu Mishima  and
H. Eugene Stanley
Osamu Mishima
Affiliation:
Nat'l Inst. for Research in Inorganic Materials, 1–1 Namiki, Tsukuba, Ibaraki 305, Japan
H. Eugene Stanley
Affiliation:
Center for Polymer Studies and Dept. of Physics, Boston Univ., Boston, MA 02215 USA
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Abstract

When ice Ih in an emulsion is compressed below 250 K, it melts to supercooled liquid water, avoiding the formation of other crystal phases. Here, we create emulsified high-pressure ices under high pressure and low temperature, and measure their temperature while these ices are decompressed at a constant rate at different temperatures. We detect metastable melting points of high-pressure ices, and identify their melting lines. We find what could be possibly two new ice phases, and discuss the relationship between decompression-induced melting and decompression-induced amorphization. Finally, we discuss briefly the analysis of experimental data and simulation results that are consistent with the hypothesized “second critical point” with temperature and pressure coordinates of approximately 200 K and 100 Mpa.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 443
Copyright
Copyright © Materials Research Society 1998

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References

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