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Solid–Solid Solutions01:24

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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Thermodynamic Properties of Ideal Solutions01:19

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For an ideal liquid solution, the standard state of each component is defined as the pure liquid at the temperature and pressure of the solution. Similarly, for solid solutions, the standard state is the pure solid. The chemical potentials of the components in the ideal solution are compared to the chemical potentials of the pure substances in their standard states. These standard states provide a reference point for calculating the thermodynamic properties of ideal solutions.For ideal...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
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Thermoelectric properties of the Ca(5)Al(2-x)In(x)Sb(6) solid solution.

Alex Zevalkink1, Jessica Swallow, Saneyuki Ohno

  • 1Thermal Energy Conversion Technologies Group, Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, USA.

Dalton Transactions (Cambridge, England : 2003)
|September 17, 2014
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Alloying Zintl phases Ca(5)Al(2-x)In(x)Sb(6) did not improve thermoelectric performance. While reducing thermal conductivity, alloying also decreased electronic mobility, leaving the figure of merit unchanged.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Thermoelectric Materials

Background:

  • Zintl phases exhibit complex structures favorable for thermoelectric applications.
  • Previous studies showed promising thermoelectric properties (zT values of 0.6-0.7) in Ca(5)Al(2)In(x)Sb(6) and related compounds.
  • Alloying is a strategy to enhance thermoelectric materials by reducing lattice thermal conductivity.

Purpose of the Study:

  • Investigate the high-temperature thermoelectric properties of the Ca(5)Al(2-x)In(x)Sb(6) solid solution.
  • Determine the effect of Al/In alloying on thermoelectric performance.
  • Evaluate the impact of alloying on carrier concentration, Seebeck effect, mobility, and thermal conductivity.

Main Methods:

  • Synthesis and characterization of Ca(5)Al(2-x)In(x)Sb(6) solid solutions.
  • X-ray diffraction (XRD) to confirm solid solution formation.
  • Measurement of high-temperature thermoelectric properties, including Seebeck coefficient, electrical conductivity, and thermal conductivity.
  • Investigation of undoped and Zn-doped samples.

Main Results:

  • A full solid solution was confirmed across the Ca(5)Al(2-x)In(x)Sb(6) system via XRD.
  • The Al:In ratio had a minimal impact on carrier concentration and Seebeck coefficient.
  • Alloying led to increased scattering of charge carriers and phonons, reducing electronic mobility and lattice thermal conductivity.

Conclusions:

  • The thermoelectric figure of merit (zT) in Ca(5)Al(2-x)In(x)Sb(6) was not significantly affected by Al/In alloying.
  • The observed trade-off between reduced lattice thermal conductivity and decreased electronic mobility counteracted potential performance gains.
  • Further optimization strategies may be needed to enhance the thermoelectric efficiency of this Zintl phase system.