Magnetic and cryogenic magnetocaloric properties of GdPO4 nanorods
作者： Y.Y. Yu , Dimitar N. Petrov , K.C. Park , B.T. Huy , Phan The Long
DOI: 10.1016/J.JMMM.2020.167452
关键词:
摘要: Abstract A sample of GdPO4 nanorods (NRs) with average diameter about 20 nm and length 150 nm has been prepared by a hydrothermal method. The analyses the XRD pattern transmission electron microscopy images have proved that NRs are single crystals hexagonal structure. variations magnetization versus temperature magnetic field confirmed ordering at low temperatures. assessment magnetocaloric effect from isotherms, M(H), in range T = 2 – 25 K revealed strong increase entropy change (|ΔSm|) below T = 15 K increasing H. reaches maximum ( | Δ S m max ) temperatures 2.7 K, around ferromagnetic–paramagnetic transition. It found relative cooling power (RCP) refrigerant (RC) H broadened linewidth |ΔSm(T)| curve. At H = 60 kOe, values RCP (or RC) 56.2 J/kg⋅K 415.9 (296.5) J/kg, respectively. Our also inferred exhibit short-range order coexisting ferromagnetic antiferromagnetic interactions.
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