Ultra-slow dynamics in low density amorphous ice revealed by deuteron NMR: indication of a glass transition

2013 ◽  
Vol 15 (23) ◽  
pp. 9308 ◽  
Author(s):  
Florian Löw ◽  
Katrin Amann-Winkel ◽  
Thomas Loerting ◽  
Franz Fujara ◽  
Burkhard Geil
Keyword(s):  
Glass Transition ◽  
Low Density ◽  
Slow Dynamics ◽  
Amorphous Ice ◽  
Deuteron Nmr

ANALYSIS OF HEAT CAPACITY AND GLASS TRANSITION IN AMORPHOUS ICE

2010 ◽  
Vol 24 (17) ◽  
pp. 1915-1921 ◽  
Author(s):  
H. YURTSEVEN ◽  
M. KURT
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Transition Temperature ◽  
Critical Exponent ◽  
Power Law ◽  
Critical Behavior ◽  
High Density ◽  
Low Density ◽  
Amorphous Ice

We analyze the heat capacity CP for low and high-density amorphous ice below the transition temperature (TC ≈ 140 K ) using a power-law formula. The renormalized critical exponent αR is extracted from the observed CP data, which describes similar critical behavior for both low and high-density amorphous ice below TC. Our analysis can also describe a glass transition in the low-density amorphous ice which is made from the high-density amorphous ice at 124 K, as observed experimentally.

Slow Dynamics Due to the Metal-Nonmetal Transition in Liquids

2003 ◽  
Vol 217 (7) ◽  
pp. 803-816 ◽  
Author(s):  
Makoto Yao ◽  
Hirotaka Kohno ◽  
Hiroaki Kajikawa
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Liquid Glass ◽  
Sound Attenuation ◽  
Slow Dynamics ◽  
Anomalous Increase ◽  
Relaxation Strength ◽  
Transition Range ◽  
Liquid Dynamics ◽  
Nonmetal Transition

AbstractIt is well known that the liquid dynamics slows down on approaching the liquid-gas critical point or the liquid-glass transition. Recently we have found by the sound attenuation measurements that the metal-nonmetal (M-NM) transition also induces slow dynamics. In the M-NM transition range of expanded liquid Hg, we have observed anomalous increase in the sound attenuation due to the structural relaxation process. Assuming a simple Debye-type relaxation, we have estimated that the relaxation time should be of the order of nanoseconds and revealed that the relaxation strength has a broad maximum in the M-NM transition range. Moreover, two types of anomalies have been observed also in the semiconductor-metal (S-M) transition range of liquid Te-Se mixtures. We present the recent experimental results of the sound attenuation measurements and discuss briefly the mechanisms of the slow dynamics in the metal-nonmetal transition range of liquids.

scholarly journals Cole-Cole Analysis for Slow Dynamics near the Liquid-Glass Transition.

1996 ◽  
Vol 53 (10) ◽  
pp. 675-681
Author(s):  
Jun MATSUI ◽  
Takashi ODAGAKI
Keyword(s):  
Glass Transition ◽  
Liquid Glass ◽  
Slow Dynamics

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'.

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
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