scholarly journals Coexistence of Phases in a Protein Heterodimer

2012 ◽  
Vol 137 (3) ◽  
pp. 035101 ◽  
Author(s):  
Andrey Krokhotin ◽  
Adam Liwo ◽  
Antti J. Niemi ◽  
Harold A. Scheraga
Keyword(s):  
Coexistence Of Phases

Microstructural observations of the “Wustite-Spinel” coexistence following quenching of cation-excess spinels, Ni2(1+x)Ti1-xO4

1990 ◽  
Vol 48 (4) ◽  
pp. 1058-1059
Author(s):  
Ian M. Anderson ◽  
Arnulf Muan ◽  
C. Barry Carter
Keyword(s):  
Film Growth ◽  
Spinel Phase ◽  
Model Systems ◽  
Ion Milling ◽  
Coexistence Of Phases ◽  
Nonequilibrium Conditions ◽  
Diffraction Patterns ◽  
Spinel Structures ◽  
Highly Porous ◽  
Standard Techniques

Oxide mixtures which feature a coexistence of phases with the wüstite and spinel structures are considered model systems for the study of solid-state reaction kinetics, phase boundaries, and thin-film growth, and such systems are especially suited to TEM studies. (In this paper, the terms “wüstite” and “spinel” will refer to phases of those structure types.) The study of wüstite-spinel coexistence has been limited mostly to systems near their equilibrium condition, where the assumptions of local thermodynamic equilibrium are valid. The cation-excess spinels of the type Ni2(1+x)Ti1-xO4, which reportedly exist only above 1375°C4, provide an excellent system for the study of wüstite-spinel coexistence under highly nonequilibrium conditions. The nature of these compounds has been debated in the literature. X-ray and neutron powder diffraction patterns have been used to advocate the existence of a single-phase, non- stoichiometric spinel. TEM studies of the microstructure have been used to suggest equilibrium coexistence of a stoichiometric spinel, Ni2TiO4, and a wüstite phase; this latter study has shown a coexistence of wüstite and spinel phases in specimens thought to have been composed of a single, non- stoichiometric spinel phase. The microstructure and nature of this phase coexistence is the focus of this study. Specimens were prepared by ball-milling a mixture of NiO and TiO2 powders with 10 wt.% TiO2. The mixture was fired in air at 1483°C for 5 days, and then quenched to room temperature. The aggregate thus produced was highly porous, and needed to be infiltrated prior to TEM sample preparation, which was performed using the standard techniques of lapping, dimpling, and ion milling.

Dark energy from coexistence of phases

2006 ◽  
Vol 642 (4) ◽  
pp. 287-293 ◽  
Author(s):  
Ariel Mégevand
Keyword(s):  
Dark Energy ◽  
Coexistence Of Phases

Dynamical coexistence of phases in molecular clusters

2001 ◽  
Vol 115 (18) ◽  
pp. 8583-8591 ◽  
Author(s):  
Ana Proykova ◽  
Stoyan Pisov ◽  
R. Stephen Berry
Keyword(s):  
Molecular Clusters ◽  
Coexistence Of Phases

scholarly journals Coexistence of phases and the observability of random graphs

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Antoine Allard ◽  
Laurent Hébert-Dufresne ◽  
Jean-Gabriel Young ◽  
Louis J. Dubé
Keyword(s):  
Random Graphs ◽  
Coexistence Of Phases

On the coexistence of phases in fine-grained BaTiO3 ceramics

1983 ◽  
Vol 18 (5) ◽  
pp. K56-K58 ◽  
Author(s):  
V. V. Kuleshov ◽  
M. G. Radchenko ◽  
V. P. Dudkevich ◽  
Eu. G. Fesenko
Keyword(s):  
Fine Grained ◽  
Coexistence Of Phases

An X-ray diffraction study of semiconductor and metallic vanadium dioxide

1993 ◽  
Vol 8 (4) ◽  
pp. 240-244 ◽  
Author(s):  
K. D. Rogers
Keyword(s):  
Vanadium Dioxide ◽  
Room Temperature ◽  
Transition Process ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Coexistence Of Phases ◽  
Diffraction Patterns ◽  
Tetragonal Cell ◽  
Monoclinic Cell

Powder diffraction data for semiconductor and metallic states of vanadium dioxide are presented. The structures are refined by Rietveld methods using a monoclinic cell (a = 5.7529Å, b = 4.5263Å, c = 5.3825Å, β = 122.61°) and space group P21/c for the room temperature data, and a tetragonal cell (a =4.5540Å, c = 2.8557Å) and space group P42/mnm for data collected at 400 K. The similarity between the corresponding X-ray diffraction patterns is discussed. The transition process from the monoclinic to tetragonal phase is investigated and initial evidence for the coexistence of phases over a small temperature range is presented.

Effects of Gauss–Bonnet entropy on thermodynamics of Kiselev black hole

2020 ◽  
Vol 29 (15) ◽  
pp. 2050101
Author(s):  
Abdul Jawad ◽  
Iqra Siddique ◽  
Iarley P. Lobo ◽  
Wardat us Salam
Keyword(s):  
Black Hole ◽  
Extended Phase Space ◽  
De Sitter ◽  
Extended Phase ◽  
First Law Of Thermodynamics ◽  
Coexistence Of Phases ◽  
Combined Action ◽  
The Impact ◽  
Bonnet Term ◽  
Modified Entropy

In this paper, the thermodynamics of Reissner–Nordström-anti de Sitter black hole surrounded by quintessence is studied and the impact of the Gauss–Bonnet term is measured. The modified entropy, first law of thermodynamics and corresponding Smarr relation are derived due to the combined action of the Gauss–Bonnet term and quintessence fluid. We study the so-called black hole chemistry from the analysis of the corresponding equation-of-state, conjugate potential and the critical points in the extended phase space. To study the phase transitions, we plotted [Formula: see text], [Formula: see text] and [Formula: see text] diagrams and analyzed the conditions for the coexistence of phases.

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