Gd60Co26Al14大块非晶合金的磁熵变

Magnetic Entropy Change of Gd60Co26Al14 Bulk Metallic Glass

摘要:

利用铜模吸铸法制备了Gd60Co26Al14非晶合金。采用示差扫描量热法（DSC），X射线衍射（XRD）和超导量子磁强计（SQUID）研究了其结构与磁热性能。XRD分析表明：铸态Gd60Co26Al14合金是完全的非晶结构；DSC测试显示Gd60Co26Al14合金在加热过程中在571 K发生玻璃化转变，并且出现了两个结晶温度，分别是602 K和642 K。 SQUID测试结果表明：Gd60Co26Al14合金出现两个居里温度，分别是82 K和128 K；合金在外磁场5 T下82 K处的磁熵变达到7 J·

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