A compact gadolinium-based fluorocarbonate magnetic refrigeration material, a preparation method and application thereof

By designing a dense gadolinium-based fluorocarbonate magnetic refrigeration material NaGdCO3F2 and constructing a three-dimensional honeycomb lattice framework, the problem of insufficient magnetic entropy change of existing magnetic refrigeration materials at low magnetic order temperatures was solved, achieving large magnetic entropy change and structural stability, making it suitable for applications in extremely low temperature environments.

CN122511701APending Publication Date: 2026-08-04DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202610974764.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-01
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

Existing magnetic refrigeration materials, while maintaining a large magnetic entropy change, struggle to broaden the effective refrigeration temperature range. Furthermore, traditional hydrated magnetic refrigerants are unstable and cannot simultaneously possess good structural stability and low magnetic order temperature.

Method used

A dense gadolinium-based fluorocarbonate magnetic refrigeration material, NaGdCO3F2, was designed. By introducing diamagnetic Na+ cations and fluoride/carbonate mixed bridging ligands, a three-dimensional honeycomb lattice framework was constructed to suppress magnetic exchange interactions, form short-range magnetic correlations, and ensure high Gd3+ spin density and low magnetic order temperature.

Benefits of technology

A large magnetic entropy change was achieved at low magnetic order temperature, which broadened the cooling range. The material exhibited excellent physicochemical and thermodynamic stability at extremely low temperatures. The preparation method is simple and easy to implement, making it suitable for industrial production.

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Abstract

The application belongs to the technical field of magnetic functional materials, and discloses a dense gadolinium-based fluorocarbonate magnetic refrigeration material and a preparation method and application thereof. The chemical formula of the gadolinium-based fluorocarbonate magnetic refrigeration material is NaGdCO3F2. The material is constructed by anti-magnetic sodium ions and fluorine ions and carbonic acid root mixed bridging ligands to form a dense gadolinium-based three-dimensional honeycomb framework structure. The specific spatial arrangement effectively suppresses the magnetic exchange interaction while maintaining high magnetic density, induces short-range magnetic correlation near 0.5K, suppresses the magnetic order temperature to 0.22K, and widens the effective refrigeration temperature range by generating a Schottky abnormal specific heat wide peak. Under 1T, 2T and 7T magnetic fields, the maximum magnetic entropy change reaches 23.1, 38.9 and 59.1 J·kg ‑1 ·K ‑1 respectively. As an excellent low-temperature magnetic refrigerant, the material has the advantages of good thermal stability, simple preparation process and low cost, and has a wide industrial application prospect in the field of adiabatic demagnetization refrigeration materials.
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