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A Magnetocaloric Glass from an Ionic-Liquid Gadolinium Complex.

Seda Kartal1, Guillaume Rogez2, Jérôme Robert2

  • 1Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France.

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|April 20, 2022
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Summary

Researchers discovered a novel molecular glass exhibiting a magnetocaloric effect (MCE), a significant finding for magnetic refrigeration. This gadolinium-based ionic liquid shows promising MCE properties at low temperatures.

Keywords:
gadolinium complexesionic liquidsmagnetocaloric effectmolecular glassesmolecular magnets

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Area of Science:

  • Materials Science
  • Magnetism
  • Chemical Synthesis

Background:

  • Ionic liquids offer unique properties for advanced applications.
  • Molecular glasses are typically not associated with significant magnetic effects.
  • Gadolinium compounds are known for their magnetic properties.

Purpose of the Study:

  • To synthesize and characterize a novel gadolinium-based ionic liquid.
  • To investigate the magnetic properties of the synthesized material.
  • To explore the potential magnetocaloric effect (MCE) in a molecular glass system.

Main Methods:

  • Synthesis of [Gd5(L)16(H2O)8](Tf2N)15 from Gd2O3 and 1-carboxymethyl-3-ethylimidazolium chloride.
  • Variable-temperature magnetic studies to analyze magnetic interactions.
  • Isothermal variable-field magnetization measurements to assess MCE.

Main Results:

  • The synthesized material is an ionic liquid that forms a glassy state below -30°C.
  • Weak intramolecular magnetic interactions were observed in the magnetic glass.
  • The study reports the first observation of a magnetocaloric effect (MCE) in a molecular glass.

Conclusions:

  • The novel gadolinium-based ionic liquid exhibits a notable magnetocaloric effect.
  • The MCE is quantified by a magnetic entropy change of -11.36 J K⁻¹ kg⁻¹ and a refrigerant capacity of 125.9 J kg⁻¹.
  • This discovery opens new avenues for developing molecular magnetic refrigerants.