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Updated: Dec 26, 2025
06:35
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
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The System NaCl-AlCl3
Ernest M Levin1, J F Kinney2, R D Wells2
1Institute for Materials Research, National Bureau of Standards, Washington, D.C. 20234.
Summary
The NaCl-AlCl3 system was re-examined, confirming the intermediate compound sodium aluminum chloride tetrahydrate (NaAlCl4) with an incongruent melting point. A liquid immiscibility region was identified between 80.25 and 99.6 mol% AlCl3 at 191.3 °C.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Physical Chemistry
Background:
- Understanding phase diagrams is crucial for materials development.
- The NaCl-AlCl3 system is relevant for applications like molten salt batteries and aluminum production.
- Previous studies indicated complexities in this system.
Purpose of the Study:
- To re-evaluate the NaCl-AlCl3 system using modern analytical techniques.
- To accurately determine the phase behavior, including intermediate compounds and liquid immiscibility.
- To provide precise data for thermodynamic modeling and industrial applications.
Main Methods:
- Differential Thermal Analysis (DTA) for thermal events.
- Visual observation for phase transitions.
- X-ray diffraction (XRD) powder techniques for crystalline phase identification.
Main Results:
- Confirmation of the intermediate compound sodium aluminum chloride tetrahydrate (NaAlCl4).
- Determination of NaAlCl4's incongruent melting point at 153 ± 0.5 °C.
- Identification of a liquid immiscibility region from 80.25 to 99.6 mol% AlCl3 at the monotectic temperature of 191.3 °C.
Conclusions:
- The NaCl-AlCl3 system exhibits a stable intermediate compound and a significant liquid immiscibility gap.
- Precise characterization of this system is vital for its effective utilization in various chemical processes.
- The findings contribute to a more complete understanding of alkali metal-aluminum chloride systems.
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