Publications by authors named "Werner Schustereder"

2 Publications

  • Page 1 of 1

High density amorphous ice from cubic ice.

Chemphyschem 2006 Jun;7(6):1203-6

Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Austria.

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http://dx.doi.org/10.1002/cphc.200600011DOI Listing
June 2006

Amorphous ice: stepwise formation of very-high-density amorphous ice from low-density amorphous ice at 125 K.

Phys Rev Lett 2006 Jan 18;96(2):025702. Epub 2006 Jan 18.

Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innsbruck, Austria.

On compressing low-density amorphous ice (LDA) at 125 K up to 1.6 GPa, two distinct density steps accompanied by heat evolution are observable in pressure-density curves. Samples recovered to 77 K and 1 bar after the first and second steps show the x-ray diffraction pattern of high-density amorphous ice (HDA) and very HDA (VHDA), respectively. The compression of the once formed HDA takes place linearly in density up to 0.95 GPa, where nonlinear densification and HDA --> VHDA conversion is initiated. This implies a stepwise formation process LDA--> HDA --> VHDA at 125 K, which is to the best of our knowledge the first observation of a stepwise amorphous-amorphous-amorphous transformation sequence. We infer that the relation of HDA and VHDA is very similar to the relation between LDA and HDA except for a higher activation barrier between the former. We discuss the two options of thermodynamic versus kinetic origin of the phenomenon.
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http://dx.doi.org/10.1103/PhysRevLett.96.025702DOI Listing
January 2006