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High-Performance Magnetic Refrigerant Featuring One-Dimensional Gd-O Chains and O-Gd3 Triangles
1Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Abstract:
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, Gd5 BSi2 O13 , containing chains of face-shared GdO9 polyhedra and geometrically frustrated OGd3 triangles. Magnetic measurements indicate that Gd5 BSi2 O13 exhibits a large magnetocaloric effect (MCE) about 1.74 times that of the practical magnetic refrigerant GGG (-ΔSm =67.0 J kg-1 K-1 ). We analyzed the origin of the large MCE by comparing GdIII -containing compounds with different structures and concentrations of GdIII .
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