High-quality NaGd(BO)O crystals have been successfully grown using the top-seeded solution growth method (TSSG), employing a NaO - NaF - BO flux system with optimal molar ratios of NaGd(BO)O : NaCO : NaF : HBO = 1:2:6:4. The magnetic and magnetocaloric properties were investigated including magnetic susceptibility (), magnetization (), and isothermal magnetic entropy change () measurements. NaGd(BO)O exhibits a large magnetocaloric effect with a maximum of 41.6 J·kg·K at 2 K and 7 T, which is higher than that of commercial GdGaO (GGG, = 38.4 J·kg·K at 2 K and 7 T) and most other Gd-based borates, showing the potential application in the field of magnetic refrigeration.

中文翻译：

---

Na2Gd2(BO3)2O晶体的生长和磁热效应

采用顶晶溶液生长法 (TSSG)，采用 NaO - NaF - BO 助熔剂系统，并具有最佳摩尔比 NaGd(BO)O : NaCO : NaF : HBO ，成功生长了高质量的 NaGd(BO)O 晶体= 1:2:6:4。研究了磁和磁热特性，包括磁化率 ()、磁化强度 () 和等温磁熵变 () 测量。 NaGd(BO)O表现出巨大的磁热效应，在2 K和7 T时最大磁热效应为41.6 J·kg·K，高于商业GdGaO (GGG，在2 K和7 T时= 38.4 J·kg·K) T）和大多数其他钆基硼酸盐，显示出在磁制冷领域的潜在应用。