简介：TheeffectofMnsubstitutiononphasestructure,hydrogenhydriding/dehydridingproperties(plateaupressureandslope)andreactionheatenthalpyofLaNi4.25-xAl0.75Mnxalloys(x=0,0.25,0.35,0.45,0.55and0.65)werestudied.TheexperimentalresultsshowthatallLaNi4.25-xAl0.75MnxalloyshavesinglephaseandhavethesamehexagonalstructureasthatofLaNi5alloy(CaCu5type,P6/mmm).WithincreasingMnsubstitutioncontent,thecellparametersofLaNi4.25-xAl0.75Mnxalloygreatlyincrease,butthemaximumhydrogenstoragecapacityandtheequilibriumabsorptionpressureofLaNi4.25-xAl0.75Mnxalloydecreasefrom1.38wt.%to1.18wt.%andfrom1.61to0.0712MPa,respectively.Moreover,thehydrogenpressureplateauslopefactorσincreasesfrom0.014to0.18,butthehysteresisfactorisnearlyconstant.Theheatenthalpyabsolutevalue|ΔHplat|increasesfrom46.7kJ·mol-1H2to56.1kJ·mol-1H2astheMncontentxincreasesfrom0to0.65.

简介：阶段和磁电机在合金R(Co_(1-x)Sn_x)的热量的效果有x=的_20，0.025，0.050，0.075，和0.100被X光检查衍射分析和磁化测量调查。在RCo_2的Sn的替换是有限的。为RCo_2的合金的立方的MgCu_2-typestructure被X光检查粉末衍射证实，留下的合金主要由RCo_2阶段组成了，与一些RCo_3和R_5Sn_3杂质阶段一起。Theimpurity阶段随Sn内容的增加增加。合金的T_c不对为Dy(Co_(1-x)Sn_x)的Sn替换很敏感_2和Tb(Co_(1-x)Sn_x)_2inGd(Co_(1-x)Sn_x)_2，居里温度显著地增加。最大的磁性的熵在合金Dy(Co_(1-x)Sn_x)改变_2(x=0，0.025，0.050，0.075)是5.78，5.43，3.88，并且2.98J·kg~(-1)·K~(-1),分别地，并且那些在Tb(Co_(1-x)Sn_x)_2(x=0，0.025)是3.44，and2.29J·kg~(-1)·K~(-1)分别地0-2.0T在应用的地里变化。