Under development

Magnetocaloric Spheres
for Hydrogen Liquefaction Magnetic Refrigerator


We are developing Er-Co-based magnetocaloric spheres for hydrogen liquefaction magnetic refrigerators to achieve higher efficiency for the upcoming hydrogen society.

Development Summary

We are collaborating with the National Institute for Materials Science (NIMS) to develop magnetic spheres for magnetic refrigeration.

(Project name:Development of Advanced Hydrogen Liquefaction System by using Magnetic Refrigeration Technology for JST-MIRAI Large-scale Project)

  • Comparison of Hydrogen Carriers
    Liquid hydrogen is one of the most promising carriers, offering advantages of density and purity.
Transportation efficiency Energy for hydrogen extraction Handling temperature Economic efficiency
*Target by 2030
Hydrogen density Hydrogen content
Liquid hydrogen 70.8% 100kg-H2/m3 0.90kJ/mol-H2 -253℃ ¥30/Nm3 (*)
MCH 47.3% 6.16kg-H2/m3 67.5kJ/mol-H2 -95~100℃ ¥50/Nm3
Ammonia 121% 17.8kg-H2/m3 30.6kJ/mol-H2 -34℃ ¥48/Nm3
(350 atm)
23.2% 100kg-H2/m3 - Ordinary temperature ¥30/Nm3 (*)

Ref : Report from the Central Research Institute of Electric Power Industry (2018),
Report from the International Environment and Economy Institute (2020)

Prototype of Hydrogen Magnetic Refrigerator

Magnetocaloric property of Er-Co Magnetic Spheres

  • Considerable large entropy change (ΔS) with magnetic field will enhance the performance of magnetic refrigerators for hydrogen liquefaction at 20 K (-253 ℃).
  • Peak values of the entropy change (ΔS) with temperature can be adjusted by changing the concentrations of Al, Fe, or Ni.

Application of Core Technology

The following technologies owned by JX Metals enable the composition, particle size distribution, and particle shape of magnetic spheres to be controlled.

  • Composition and Microstructure Design

    • Metals, alloys,
      and composites design
  • Surface Design

    • Surface deposition
      and plating
    • Surface treatment
  • Powder Design

    • Powder manufacturing
    • Powder handling
  • Purification

    • Melting
  • Analysis and Evaluation

    • Inorganic and
      organic analysis
    • Surface analysis and
      structural analysis
  • Extraction and Refining

    • Recycling

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