Magnetic Entropy Change of Gd60Co26Al14 Bulk Metallic Glass

Abstract:

Bulk metallic glassy (BMG) alloys Gd60Co26Al14 were prepared by a copper-mold casting method. Their structure and thermomagnetic properties were studied by DSC, XRD and SQUID. XRD analysis shows that the as-cast Gd60Co26Al14 cylinder was fully amorphous structure in 3 mm diameter. The DSC reveals that Gd60Co26Al14 BMG had a distinct glass transition temperature at 571 K and two crystallization temperatures at 602 K and 642 K, respectively. SQUID measurements indicate that the Gd60Co26Al14 BMG had two Curie temperatures occurring at 82 K and 128 K, respectively. The entropy change was 7 J·(kg·K)-1 at 82 K in 5 T magnetic field

Key words:bulk metallic glass; Curie temperature; isothermal magnetic entropy change; magnetic refrigerating materials