Pressure phase diagrams

Brady et al. [18] have discussed temperature/pressure phase diagrams for carbon dioxide-DDT and carbon dioxide-polychlorobiphenyls and... 

Figure 7 shows the temperature-pressure phase diagrams for STO 18-92 and SCT(0.007) [21]. The data show clear evidence that Tc for STO 18 vanishes with an infinite slope, i.e., dTc/dp - cx) as Tc 0 K. This is a requirement of the third law of thermodynamics for both first- and second-order phase... 

Fig. 18 Temperature-uniaxial pressure phase diagram in the low temperature region of k-(ET)2Cu2(CN)3 [361], The strain along the c-axis corresponds to decrease ijt left side), while the stress along the h-axis increases tljt right side)...

Sushko YV, Ito H, Ishiguro T, Horiuchi S, Saito G (1993) Reentrant superconductivity in k-(BEDT-TTF)2Cu[N(CN)2]C1 and its pressure phase diagram. Solid State Commun 87 997-1000... 

Binary interactinide normal pressure phase diagrams are known in more or less detail for U-Np, Np-Pu, Pu-Am, Th-U, U-Pu. 

Fig. 4. Proposed temperature-pressure phase diagram of iron (after Saxena and Littlewood 2001) with the ferromagnetic body-centered cubic (bcc) phase, the paramagnetic face-centered cubic phase (fee) and the...

Fig. 7. The temperature-pressure phase diagram of UGe2 (Saxena et al. 2000). Tq is the Curie temperature and Tgc the superconducting transition temperature (normally denoted Tc).

Distillation processes have a degree of flexibility not available to freezing processes in the choice of an operating temperature. The almost vertical ice-water line in the temperature-pressure phase diagram for water indicates essentially a fixed operating temperature. Similarly this is true for the hydrate-water line in the hydrate systems. The effect on vapor volume resulting from the relationship between vapor pressure and... 

Figure 14.7 Schematic representation of the different types of binary (liquid + liquid) phase equilibria, showing the effect of p, T, and x on the two-phase volume. Examples are known for all except figures (k), (o), and (s). Reproduced with permission from G. M. Schneider, High-pressure Phase Diagrams and Critical Properties of Fluid Mixtures , M. L. McGlashan, ed., Chapter 4 in Chemical Thermodynamics, Vol. 2, The Chemical Society, Burlington House, London, 1978.

FIGURE 12.1 Illustration of a general temperature-pressure phase diagram. 

Figure 8. Temperature versus pressure phase diagram of a micellar solution of sodium oleate, 13 wt % in water. (Adapted from ref. 19).

The low-pressure phase diagram of carbon dioxide, shown in Fig. 10, is different from that of water in a number of respects. Carbon dioxide sublimates at l.Oatm, leading to solid C02 being called dry ice. The triple point is at 5.1 atm... 

The Earth s core is thought to be mainly iron, and seismic data indicate that the inner core is solid and the outer core is liquid. The pressure at the center of the Earth is 3.6 x 1011 Pa, and at this pressure, iron melts at 6350 K. From this information, what can you infer about the solid-liquid equilibrium boundary in the iron high-pressure phase diagram (Pressure and temperature both increase toward the Earth s center.)... 

Fig. 8 Low-pressure phase diagram for C60 deduced from compression studies. Full curves show observed polymerization and depolymerization coordinates and dashed line the equilibrium line. The fcc-sc phase boundary is also shown, for comparison. Reprinted with permission from IO Bashkin, VI Rashchupkin, AF Gurov, AP Moravsky, OG Rybchenko, NP Kobelev,YM Soifer, and EG Ponyatovskii, WA new phase transition in the T-P diagram of C60 fullerite , J. Phys. Condens. Matter vol. 6 (1994) 7491-98 [58]. Copyright 1994 Institute of Physics Publishing Ltd...

Figure 12.6 shows what is understood about the temperature-pressure phase diagram of several TMTSF salts. 

Temperature-pressure phase diagram of TMTSF and TMTTF salts [30]. 

Tinte et al.54 have carried out molecular dynamic simulations of first-principles based effective Hamiltonian for PSN under pressure and of PMN at ambient pressure that clearly exhibit a relaxor state in the paraelectric phase. Analysis of the short-to-medium range polar order allows them to locate Burns temperature Tb. Burns temperature is identified as the temperature below which dynamic nanoscale polar clusters form. Below TB, the relaxor state characterized by enhanced short-to-medium range polar order (PNR) pinned to nanoscale chemically ordered regions. The calculated temperature-pressure phase diagram of PSN demonstrates that the stability of the relaxor state depends on a delicate balance between the energetics that stabilize normal ferroelectricity and the average strength of quenched "random" local fields. 

Figure 7. Temperature-pressure phase diagram of [TTF][Ni(dmit)2]2 showing the increase of Tc with pressure. [Adapted from (223).]...

Fig. 20. Illustration of the temperature-pressure phase diagram for (TMTSF)2X salts. The critical pressure Pc varies between ambient pressure and 12 kbar for different compounds.

In a temperature vs. pressure phase diagram (Fig. 8), the triple point is defined as fhe poinf af which solid, gas, and liquid coexist as three separate phases. If one... 

Energy and Phase Changes Heating Curves Vapor Pressure Phase Diagrams The Solid State... 

Lead monoselenide Pb8e(cr) has a very narrow homogeneity range, melts congruently at 1354 K, and is the only solid compound in the lead-selenium system. Temperature-composition and temperature-pressure phase diagrams are available in the review by Novoselova, Zlomanov, Karbanov, Matveyev, and Gas kov [72NOV/ZLO]. 

Moriarty J. A. and Althoff, J. D., First-Principles Temperature-Pressure Phase Diagram of Magnesium, Phys. Rev. B51, 5609 (1995). 

Ross, M. and Rogers, F. (2006) Polymerization, shock cooling, and the high-pressure phase diagram of nitrogen, Phys. Rev. B 74, 024103... 

Figure 4.23 Temperature/pressure phase diagram of [TTF][Ni(dmit)2]2...

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