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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Phase formation and crystal structure of Sm_2Fe_(17-y)Ga_y compounds during hydrogen disproportionation and desorption recombination (HDDR-process)
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Phase formation and crystal structure of Sm_2Fe_(17-y)Ga_y compounds during hydrogen disproportionation and desorption recombination (HDDR-process)

机译：Sm_2Fe_（17-y）Ga_y化合物在氢歧化和解吸重组过程中的相形成和晶体结构（HDDR工艺）

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Hydrogen disproportionation was applied to Sm_2Fe_(17-y)Ga_y alloys with y=0,1,2 using a hydrogen pressure of up to 3 MPa. SmH_(2+x) and b.c.c. (Fe, Ga) solid solution were formed. Ga is completely dissolved in the b.c.c. Fe. The phase formation was studied as a function of the recombination temperature in the range 600 deg C<=T_R<=850 deg C. At first, metastable phases with the disordered hexagonal R_(1-s)T_(5+2s) structure (R=rare earth, T=transition metal) were formed. The atomic positions of the metastable structures were refined using the Rietveld method. In the disordered hexagonal Sm_(1-s)(Fe,Ga)_(5+2s) structure the Ga atom occupies randomly the atomic position (3g). The phase transformation of Sm_(1-s)Fe_(5+2s) and Sm_(1-s)(Fe,Ga)_(5+2s) into the modified rhombohedral Th_2Zn_(17) structure with partial order (denoted m-Sm_2Fe_(17-y)Ga_y) starts at T_R>=700 deg C and T_R>=750 deg C, respectively. In the case of Sm_2Fe_(15)Ga_2, the recombination leads to a phase mixture. A lower Ga concentration in the Th_2Zn_(17) structure is observed after recombination compared to that in the initial state. A completely ordered Th_2Zn_(17) structure is not observed after recombination. During recombination of SmH_(2+x)+b.c.c. (Fe, Ga) solid solution at T_R=600 deg C, Ga_3Sm_5 and GaSm were formed predominantly.
机译：使用高达3 MPa的氢气压力将氢歧化作用应用于y = 0,1,2的Sm_2Fe_（17-y）Ga_y合金。 SmH_（2 + x）和b.c.c.形成（Fe，Ga）固溶体。 Ga完全溶解于b.c.c.铁研究了在600摄氏度<= T_R <= 850摄氏度范围内的相形成与重组温度的关系。首先，具有无序六边形R_（1-s）T_（5 + 2s）结构的亚稳相（形成R ＝稀土，T ＝过渡金属。使用Rietveld方法精制了亚稳结构的原子位置。在无序六角形Sm_（1-s）（Fe，Ga）_（5 + 2s）结构中，Ga原子随机占据原子位置（3g）。 Sm_（1-s）Fe_（5 + 2s）和Sm_（1-s）（Fe，Ga）_（5 + 2s）的相变为具有部分顺序的改进的菱面体Th_2Zn_（17）结构（表示为m- Sm_2Fe_（17-y）Ga_y）分别在T_R> = 700摄氏度和T_R> = 750摄氏度开始。在Sm_2Fe_（15）Ga_2的情况下，重组导致相混合。与初始状态相比，重组后的Th_2Zn_（17）结构中的Ga浓度较低。重组后未观察到完全有序的Th_2Zn_（17）结构。在重组SmH_（2 + x）+ b.c.c。在T_R ＝ 600℃下形成（Fe，Ga）固溶体，主要形成Ga_3Sm_5和GaSm。

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