Abstract
High-quality Na2Gd2(BO3)2O crystals have been successfully grown using the top-seeded solution growth method (TSSG), employing a Na2O - NaF - B2O3 flux system with optimal molar ratios of Na2Gd2(BO3)2O : Na2CO3 : NaF : H3BO3 = 1:2:6:4. The magnetic and magnetocaloric properties were investigated including magnetic susceptibility (χ), magnetization (M), and isothermal magnetic entropy change (−ΔSm) measurements. Na2Gd2(BO3)2O exhibits a large magnetocaloric effect with a maximum − ΔSm of 41.6 J·kg−1·K−1 at 2 K and 7 T, which is higher than that of commercial Gd3Ga5O12 (GGG, −ΔSm = 38.4 J·kg−1·K−1 at 2 K and 7 T) and most other Gd3+-based borates, showing the potential application in the field of magnetic refrigeration.
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