1 results about "Magnetic transition temperature" patented technology

This invention discloses a core-shell structured amorphous / nanocrystalline biphase rare-earth-based magnetic refrigeration material, its preparation method, and its applications, belonging to the field of magnetic refrigeration technology. The chemical formula of this material is Gd. x M y Cu z Where 90≤x≤95, 1≤y≤5, 1≤z<5, and y>z, and M is selected from any one of Fe, Co, and Ni; its microstructure is a core-shell dual-phase structure consisting of an amorphous shell encapsulating a nanocrystalline nucleus. This material exhibits more than two magnetic transition temperatures, and its magnetic entropy change curve shows two / three peaks, with a maximum magnetic entropy change of 5.4–6.9 J kg under a 5 T applied magnetic field. ‑1 K ‑1 The magnetic refrigeration temperature range reaches 106-220 K, with a relative refrigeration capacity of 731-1265 J / kg. This material combines high magnetic entropy change, wide refrigeration temperature range, excellent chemical stability, and high service reliability, making it suitable for widespread application as a magnetic refrigerant in the field of green solid-state refrigeration.