Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Ultrasonic velocity for an equimolar mixture of molten AgI and NaCl in the biphasic region

Stepanov, V. P.[Victor P.], Minchenko, V. I.[Vladimir I.]
J. Chem. Thermodyn. 2013, 59, 250-253
ABSTRACT
The ultrasonic velocities of a molten stratifying mixture composed of 0.5 AgI and 0.5 NaCl (the composition corresponding to the top of the miscibility gap) were measured along the saturation line for a wide temperature range via the pulse method to establish the characteristics of mixing salts with different chemical bonds. We show that the difference, Du, between the magnitudes of the sound velocities for the coexisting phases decreases with increasing temperature and becomes zero at 1064 K. This temperature corresponds to the critical phase transition point, Tc. The temperature dependence of the sound velocity difference, Du, is described by the equation Du= (Tc -T)o, where o = 0.896, which is less than that found for alkali halide melts (o= 1.02), in which long-range Coulomb forces between ions prevail. The results are discussed in terms of the peculiarity of the chemical bond in silver iodide.
Compounds
# Formula Name
1 AgI silver iodide
2 ClNa sodium chloride
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Normal melting temperature, K ; Crystal
  • Crystal
  • Liquid
  • Air at 1 atmosphere
  • VISOBS
  • 1
  • POMD
  • 2
  • Normal melting temperature, K ; Crystal
  • Crystal
  • Liquid
  • Air at 1 atmosphere
  • VISOBS
  • 1
  • POMD
  • 2
  • 1
  • Speed of sound, m/s ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Mole fraction - 2; Liquid
  • Liquid
  • Pulse-echo method
  • 3
  • POMD
  • 2
  • 1
  • Speed of sound, m/s ; Liquid mixture 1
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • Pulse-echo method
  • 12
  • POMD
  • 2
  • 1
  • Speed of sound, m/s ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Pulse-echo method
  • 12
  • POMD
  • 2
  • 1
  • Liquid-liquid equilibrium temperature, K ; Liquid mixture 1
  • Mole fraction - 2; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • From speed of sound
  • 1