Structure of high- and low-density amorphous ice

2000 ◽  
Vol 61 (1) ◽  
pp. 28-31 ◽  
Author(s):  
László Pusztai
Keyword(s):  
Low Density ◽  
Amorphous Ice

scholarly journals X-ray studies of the transformation from high- to low-density amorphous water

2019 ◽  
Vol 377 (2146) ◽  
pp. 20180164 ◽  
Author(s):  
Daniel Mariedahl ◽  
Fivos Perakis ◽  
Alexander Späh ◽  
Harshad Pathak ◽  
Kyung Hwan Kim ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Structural Evolution ◽  
High Energy ◽  
Real Space ◽  
High Density ◽  
Low Density ◽  
X Ray ◽  
Amorphous Ice ◽  
Density State ◽  
Amorphous States

Here we report about the structural evolution during the conversion from high-density amorphous ices at ambient pressure to the low-density state. Using high-energy X-ray diffraction, we have monitored the transformation by following in reciprocal space the structure factor S OO ( Q ) and derived in real space the pair distribution function g OO ( r ). Heating equilibrated high-density amorphous ice (eHDA) at a fast rate (4 K min –1 ), the transition to the low-density form occurs very rapidly, while domains of both high- and low-density coexist. On the other hand, the transition in the case of unannealed HDA (uHDA) and very-high-density amorphous ice is more complex and of continuous nature. The direct comparison of eHDA and uHDA indicates that the molecular structure of uHDA contains a larger amount of tetrahedral motives. The different crystallization behaviour of the derived low-density amorphous states is interpreted as emanating from increased tetrahedral coordination present in uHDA. This article is part of the theme issue ‘The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.

Nature of the transformations of ice I and low‐density amorphous ice to high‐density amorphous ice

1989 ◽  
Vol 91 (11) ◽  
pp. 7187-7192 ◽  
Author(s):  
M. A. Floriano ◽  
Y. P. Handa ◽  
D. D. Klug ◽  
Edward Whalley
Keyword(s):  
High Density ◽  
Low Density ◽  
Amorphous Ice

Structural Relaxation of Low-Density Amorphous Ice upon Thermal Annealing

2013 ◽  
Vol 4 (21) ◽  
pp. 3672-3676 ◽  
Author(s):  
Jacob J. Shephard ◽  
John S. O. Evans ◽  
Christoph G. Salzmann
Keyword(s):  
Thermal Annealing ◽  
Structural Relaxation ◽  
Low Density ◽  
Amorphous Ice

Nature of the transformations of ice i and low-density amorphous ice to high-density amorphous ice

1990 ◽  
Vol 4 (1-6) ◽  
pp. 396-398 ◽  
Author(s):  
M. A. Floriano ◽  
Y. P. Handa ◽  
D. D. Klug ◽  
Edward Whalley
Keyword(s):  
High Density ◽  
Low Density ◽  
Amorphous Ice
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