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Congruent melting points

System in which the two components form a compound p>ossessing a congruent melting point. ... [Pg.1201]

Equations (109) and (110) imply that Eq. (17) for the auxiliary condition on ASM is satisfied. The next independent constraint applied is then the requirement that the relative chemical potential of the species ac must equal the Gibbs energy of formation of AC(s) at the congruent melting point. This allows one to express the entropy of dissociation of ac as... [Pg.197]

Conglomerate, 25 Congruent melting point, 29 Congo red, 979 Conjugate solutions, 17-20 Consolute temperature, 17, 18, 19, 20 Continuous extraction, of liquids by solvents, 152-154... [Pg.1171]

The qualitative form of a congruent melting-point diagram is as follows (with hatch-marks in two-phase regions omitted for clarity) ... [Pg.265]

Congruent melting points are commonly encountered both in metallic and organic systems. The former is exemplified by the binary Zn/Mg system (with MgZn2 compound), whereas the latter is exemplified by phenol/aniline mixtures (with 1 1 hydrogen-bonded complex). [Pg.266]

The kind of information desired proceeds from the qualitative — congruent melting point or decomposition products to the quantitative — melting points, decomposition pressures, and rates of decomposition, i.e., thermodynamics and kinetics. [Pg.17]

Figure 11.14. Metastable extensions of equilibrium-phase boundaries. Solvus line extensions usually form a liquid miscibility dome. Extensions of incongruently melting compounds form a congruent melting point and extensions of congruently melting compounds often form eutectics with non-neighboring phases. Figure 11.14. Metastable extensions of equilibrium-phase boundaries. Solvus line extensions usually form a liquid miscibility dome. Extensions of incongruently melting compounds form a congruent melting point and extensions of congruently melting compounds often form eutectics with non-neighboring phases.
A phase diagram investigation (494) of the l-pentene-AgBF4 system has shown the 2 1 and 3 1 complexes with congruent melting points at 43.3 and —30.3°C, respectively. In addition, evidence is provided for the existence of a 1 1 complex stable only in the solid state at temperatures below about — 10°C. It appears to be formed by a solid state reaction between the 2 1 complex and AgBF4. [Pg.336]

The incongruent melting point is obtained from Massazza ( 1). Previous work by Coughanour ( ) indicates congruent melting point at 1903 K. The A. is estimated from those of Na 0 2Ti0 and Na 0 Ti0 observed by Naylor (3) and CaO-TiO -SiO observed... [Pg.1477]

We adopt the congruent melting point from Brewer ( ). The enthalpy of fusion is estimated assuming an entropy of fusion of 3 cal K g-atora as suggested by Kubaschewski et al. (1 ). This gives a enthalpy of fusion of 31 kcal mol and the... [Pg.1526]

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