Li Liang, Chen Yuqi, He Junbao, Zhou Aiguo
School of Mechanical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, China.
Jinguan Electric Co., Ltd., Nanyang 473000, China.
Molecules. 2022 Sep 2;27(17):5660. doi: 10.3390/molecules27175660.
For this work, europium monosulfide (EuS) powders were prepared by sulfurizing EuO powder with CS gas. The synthesized EuS powders were sintered by SPS at temperatures in the 800-1600 °C range for 0.33-1 h at 50 MPa under vacuum conditions. The influences of Yb doping and sintering conditions on the magnetocaloric and mechanical properties of EuS were investigated systematically. An increase in sintering temperature caused the rise of lattice parameters of EuS, whereas Yb doping caused them to drop. SEM showed that the grain size of the EuS increased with sintering temperatures in the 1000-1400 °C range. Higher sintering temperatures can enlarge the magnetizability and saturation magnetization of EuS compact. On the contrary, Yb doping can weaken the magnetizability and saturation magnetization of EuS compact. All sintered polycrystalline EuS compacts had weaker thermomagnetic irreversibility and lower magnetic anisotropy.
在这项工作中，通过用CS气体硫化EuO粉末制备了单硫化铕（EuS）粉末。合成的EuS粉末在真空条件下于800 - 1600℃范围内、50MPa压力下通过放电等离子烧结（SPS）烧结0.33 - 1小时。系统研究了Yb掺杂和烧结条件对EuS磁热性能和力学性能的影响。烧结温度升高导致EuS晶格参数增大，而Yb掺杂使其降低。扫描电子显微镜（SEM）显示，在1000 - 1400℃范围内，EuS的晶粒尺寸随烧结温度升高而增大。较高的烧结温度可增大EuS块体的磁化率和饱和磁化强度。相反，Yb掺杂会削弱EuS块体的磁化率和饱和磁化强度。所有烧结的多晶EuS块体的热磁不可逆性较弱且磁各向异性较低。
