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利用X射线衍射仪(XRD)和VSM测量La_(1-x)Ce_xFe_(11.44)Si_(1.56)合金吸氢前后的相结构及磁性曲线,利用DSC测量了La_(0.8)Ce_(0.2)Fe_(11.44)Si_(1.56)Hy的热重曲线。结果表明,La_(1-x)Ce_xFe_(11.44)Si_(1.56)合金及其氢化物的主相均为NaZn_(13)型立方结构,吸氢后合金的居里温度明显升高,在室温空气中放置一段时间后,仍能保持良好的稳定性;La_(0.8)Ce_(0.2)Fe_(11.44)Si_(1.56)Hy合金约从483 K到708 K一直处于失重状态,氢化物的失重率为0.19%;通过提高放氢温度,La_(0.9)Ce_(0.1)Fe_(11.44)Si_(1.56)Hy合金的居里温度降低,放氢温度每提高10 K居里温度下降10 K左右,但对合金的等温磁熵变影响很小,熵变最小的样品与无放氢样品的熵变相差仅0.616 J/(kg·K)。
The phase structure and magnetic curve of La_ (1-x) Ce_xFe_ (11.44) Si_ (1.56) alloy before and after hydrogen absorption were measured by X-ray diffraction (XRD) and VSM, and the La_ (0.8) Ce_ (0.2) Fe_ 11.44) The thermogravimetric curve of Si_ (1.56) Hy. The results show that the main phase of La_ (1-x) Ce_xFe_ (11.44) Si_ (1.56) alloy and its hydride are all NaZn_ (13) type cubic structure. The Curie temperature of the La_ (1-x) After being placed for a period of time, the stability of La_ (0.8) Ce_ (0.2) Fe_ (11.44) Si_ (1.56) Hy alloy was always in the state of weightlessness from 483 K to 708 K. The weight loss rate of hydride 0.19%. The Curie temperature of La_ (0.9) Ce_ (0.1) Fe_ (11.44) Si_ (1.56) Hy alloy decreased and the Curie temperature decreased about 10 K for every 10 K increase in hydrogen releasing temperature by increasing the hydrogen releasing temperature. The isothermal magnetic entropy change has little effect on the alloy, and the entropy change between the sample with the smallest entropy and the sample without the hydrogen releasing is only 0.616 J / (kg · K).