High-Performance Magnetic Refrigerant Featuring One-Dimensional Gd-O Chains and O-Gd Triangles.

Magnetic cooling at low temperature has attracted intensive interest in cryogenics research, which may become important as cooling medium for long-wave photon detectors to support space exploration. Here, we report a Gd-based quaternary magnetic refrigerant material, Gd BSi O , containing chains of face-shared GdO polyhedra and geometrically frustrated OGd triangles. Magnetic measurements indicate that Gd BSi O exhibits a large magnetocaloric effect (MCE) about 1.74 times that of the practical magnetic refrigerant GGG (-ΔS =67.0 J kg  K ). We analyzed the origin of the large MCE by comparing Gd -containing compounds with different structures and concentrations of Gd .