SrGd(BO): A Gadolinium-Rich Borate with Magnetic Refrigeration Performance.

A single crystal of SrGd(BO) has been successfully grown through a high-temperature solution technique with KO-KF-BO as the flux. It crystallizes in the space group with parameters = 22.3153(5) Å, = 15.9087(4) Å, = 8.7507(2) Å, and = 2. SrGd(BO) has a three-dimensional (3D) framework built from [GdO] chains, in which the isolate [BO] groups and Sr ions fill in the space of the 3D framework. The magnetic measurements revealed that the title compound exhibits a large magnetocaloric effect with the magnetic entropy change of -Δ = 42.2 J kg K at 2 K for 7 T, which is higher than that of the commercial material, GdGaO (GGG), with -Δ of 38.4 J kg K under the same conditions. Moreover, the infrared spectrum (IR), UV-vis-NIR diffuse reflectance spectrum, and thermal stability were investigated.