Kinetics and Non-Ergodic Nature of Amorphous-Amorphous Transformations under Pressure

Lyapin, A. G.; Brazhkin, V. V.; Gromnitskaya, E. L.; Mukhamadiarov, V. V.; Stal’gorova, O. V.; Tsiok, O. B.

doi:10.1007/978-94-010-0595-1_34

Cited by 5 publications

(12 citation statements)

References 42 publications

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“…As said above concerning corresponding transitions between crystalline phases, low density amorphous semiconducting Si and Ge transform into high density metallic phases [130]. Transitions between low and high density forms of SiO 2 and GeO 2 occur without serious changes of interactions between atoms [131][132][133]. The same can be said about transitions between solid amorphous phases of water.…”

Section: Amorphous Solid Phases Of Watermentioning

confidence: 75%

“…Isothermal compression (77 K) LDA → HDA (∼0.6 GPa) [146] (the higher the temperature, the lower the pressure; at 135 K transformation occurs at P ∼ 0.2 GPa and becomes reversible with hysteresis [123,147]). Heating at ambient pressure HDA → LDA (∼115 K) → Ic ∼150 K) → Ih (∼170 K) [133]. Heating of ambient pressure VIII → LDA → Ic → Ih [68].…”

Section: Amorphous Solid Phases Of Watermentioning

confidence: 99%

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Liquid water and ices: understanding the structure and physical properties

Маленков¹

2009

J. Phys.: Condens. Matter

173

151

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A review of the structure and some properties of condensed phases of water is given. Since the discovery of the polymorphism of crystalline ice (beginning of the twentieth century), 15 ice modifications have been found and their structures have been determined. If we do not take into consideration proton ordering or disordering, nine distinct crystalline ice modifications in which water molecules retain their individuality are known. In the tenth, ice X, there are no H(2)O molecules. It contains ions (or atoms) of oxygen and hydrogen. The structure of all these modifications is described and information about their fields of stability and about the transition between them is given. It is emphasized that there are ice modifications which are metastable at any temperature and pressure (ices Ic, IV and XII), and many modifications can exist as metastable phases beyond their fields of stability. The ability of water to exist in metastable states is one of its remarkable properties. Several amorphous ice modifications (all of them are metastable) are known. Brief information about their properties and transitions between them is given. At the end of the 1960s the conception of the water structure as a three-dimensional hydrogen-bonded network was conclusively formed. Discovery of the polymorphism of amorphous ices awakened interest in the heterogeneity of the water network. Structural and dynamical heterogeneity of liquid water is discussed in detail. Computer simulation showed that the diffusion coefficient of water molecules in dense regions of the network is lower than in the loose regions, while an increase of density of the entire network gives rise to an increase of diffusion coefficient. This finding contradicts the conceptions associated with the primitive two-state models and can be explained from pressure dependences of melting temperature and of homogeneous nucleation temperature. A brief discussion of the picture of molecular motions in liquid water based on experiment and on computer simulation is given. This picture is still very incomplete. The most fascinating idea that was put forward during the last 20 years was the second critical point conjecture. It is still not clear whether this conjecture corresponds to reality.

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Section: Amorphous Solid Phases Of Watermentioning

confidence: 75%

Section: Amorphous Solid Phases Of Watermentioning

confidence: 99%

Liquid water and ices: understanding the structure and physical properties

Маленков¹

2009

J. Phys.: Condens. Matter

173

151

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“…This also implies the occurrence of a glass→ liquid transition upon heating the nonequilibrium amorphous states LDA and e-HDA and a structural resemblance between LDA and LDL and e-HDA and HDL. 46 However, our upstroke transition results are ambiguous whether the nature of the transition is first-order-like, second-order-like, or continuous. [33][34][35] However, most experiments are consistent with a glass→ liquid transition temperature T g ϳ 136 K for LDA at 1 bar, 1 and also recent experiments have suggested liquidlike properties for HDA close to the crystallization line.…”

Section: Introductionmentioning

confidence: 94%

Water polyamorphism: Reversibility and (dis)continuity

Winkel

Elsaesser

Mayer

et al. 2008

The Journal of Chemical Physics

140

152

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An understanding of water's anomalies is closely linked to an understanding of the phase diagram of water's metastable noncrystalline states. Despite the considerable effort, such an understanding has remained elusive and many puzzles regarding phase transitions in supercooled liquid water and their possible amorphous proxies at low temperatures remain. Here, decompression of very high density amorphous ice (VHDA) from 1.1 to 0.02 GPa at 140 K is studied by means of dilatometry and powder x-ray diffraction of quench-recovered states. It is shown that the three amorphous states of ice are reversibly connected to each other, i.e., LDA<-->e-HDA<-->VHDA. However, while the downstroke VHDA-->e-HDA transition takes place in the pressure range of 0.06 GPaLDA transition takes place quasi-discontinuously at p approximately 0.06 GPa. That is, two amorphous-amorphous transitions of a distinct nature are observed for the first time in a one-component system-a first-order-like transition (e-HDA-->LDA) and a transition which is not first-order like but possibly of higher order (VHDA-->e-HDA). VHDA and e-HDA are established as the most stable and limiting states in the course of the transition. We interpret this as evidence disfavoring the hypothesis of multiple first-order liquid-liquid transitions (and the option of a third critical point), but favoring a single first-order liquid-liquid transition (and the option of a second critical point).

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“…Using ultrasonic sound propagation measurements, three distinct stages were found for the temperatureinduced HDA!LDA transformation at 110-115 K, namely shear elastic softening, bulk softening, and main volume jump [187]. Whereas the first stages involve structural relaxation, the final stage is consistent with a ''first-order like'' transition-that is, the amorphous-amorphous transition shows a complex nonergodic nature that involves more than one process [65]. The relaxation stages of this combined process were studied in detail using neutron scattering [188,189].…”

Section: Irreversible Structural Transitions By Heating At 1 Barmentioning

confidence: 99%

“…The behavior of the SiO 2 glass under pressure has been intensely studied as well [39,53,[64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83]. It was established long ago that the high-pressure, hightemperature treatment causes a significant residual densification of silica glass is part of a diagram by both in situ and quenching techniques in a large volume press apparatus [51][52][53][54].…”

Section: A Silicamentioning

confidence: 99%