| Summary: | Magnetic refrigeration material is the key to adiabatic demagnetization refrigeration technology. In this work, two magnetic refrigerants, Gd<sub>5</sub>(C<sub>4</sub>O<sub>4</sub>)(HCOO)<sub>3</sub>(CO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>·2.5H<sub>2</sub>O (<b>1</b>) and Gd<sub>2</sub>(OH)<sub>4</sub>SO<sub>4</sub> (<b>2</b>), were prepared through hydrothermal reaction. Magnetic study reveals that their magnetic entropy changes are 24.8 J kg<sup>−1</sup> K<sup>−1</sup> for <b>1</b> and 15.1 J kg<sup>−1</sup> K<sup>−1</sup> for <b>2</b> at 2 K and 2 T, respectively. The magnetic entropy changes of <b>1</b> and <b>2</b> at <i>T</i> = 2 K and ∆<i>H</i> = 2 T exceed most gadolinium hydroxyl compounds, indicating that magnetic refrigerants with large magnetic entropy changes at low magnetic fields can be obtained by introducing more weak magnetic exchange ligands to replace hydroxyl groups in gadolinium hydroxyl compounds.
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