Formation mechanism, phase structure and electrochemical properties of the La–Mg–Ni-based multiphase alloys by powder sintering LaNi5 and LaMgNi4
Formation mechanism, phase structure and electrochemical properties of the La–Mg–Ni-based multiphase alloys by powder sintering LaNi5 and LaMgNi4
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粉末烧结LaNi5和LaMgNi4 La-Mg-Ni基复相合金的形成机理、相结构及电化学性能
DOI：
10.1016/j.ijhydene.2013.05.129
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发表时间：
2013-08
影响因子：
7.2
通讯作者：
Shuqin Yang
中科院分区：
文献类型：
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作者：
Jingjing Liu;Junling Zhang;Jinding Wang;Shuqin Yang
以LaNi 5和LaMgNi 4两种前驱体为原料，采用粉末烧结技术制备了四种不同相结构的合金。结果表明，LaNi 5相和LaMgNi 4相可连续反应生成（La，Mg）Ni 3和（La，Mg）2Ni 7相，前驱体LaNi 5/LaMgNi 4的摩尔比（x）对合金的相结构有显著影响。XRD和Rietveld精修结果表明，合金主要由（La，Mg）Ni 3和（La，Mg）2Ni 7（x= 0.28和0.59）或（La，Mg）2Ni 7和LaNi 5（x= 0.87和1.47）相组成。当x从0.28增加到0.59时，主相由PuNi 3型的（La，Mg）Ni 3相转变为（La，Mg）2Ni 7相，并具有Ce 2Ni 7-和Gd 2Co 7型。当x从0.59增加到0.87时，（La，Mg）Ni 3第二相消失，出现CaCu 5型LaNi 5相。当x从0.87增加到1.47时，LaNi_5相的含量从17.88增加到60.72wt（La，Mg）2Ni 7相含量下降。以（La，Mg）2Ni 7为主相、（La，Mg）Ni 3为辅相的合金有利于循环稳定性，以（La，Mg）2Ni 7为主相、LaNi 5为辅相的合金有利于高倍率放电性能。
Starting from two precursors LaNi5and LaMgNi4, four alloys with different phase structures were prepared by powder sintering technique. The results suggest that LaNi5phase can consecutively react with LaMgNi4phase generating (La,Mg)Ni3and (La,Mg)2Ni7phases, and the mole ratio of precursors LaNi5/LaMgNi4(x) affects the phase structures of alloys significantly. XRD and Rietveld refinement results demonstrate that the alloys mainly consist of (La,Mg)Ni3and (La,Mg)2Ni7phases (x= 0.28 and 0.59) or (La,Mg)2Ni7and LaNi5phases (x= 0.87 and 1.47). Whenxincreases from 0.28 to 0.59, the main phase becomes (La,Mg)2Ni7phase with Ce2Ni7- and Gd2Co7-type from PuNi3-type (La,Mg)Ni3phase. Asxrises from 0.59 to 0.87, the secondary phase (La,Mg)Ni3disappears with CaCu5-type LaNi5phase emerging. Whenxgrows from 0.87 to 1.47, the content of LaNi5phase increases from 17.88 to 60.72 wt.% with (La,Mg)2Ni7phase content declining. The alloy with (La,Mg)2Ni7as the main phase and (La,Mg)Ni3as the secondary phase is conducive to cyclic stability and the alloy with (La,Mg)2Ni7as the main phase and LaNi5as the secondary phase is beneficial to the high-rate dischargeability.
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影响因子：
6.6
作者：
X. Zhang;D. Sun;W. Yin;Y. Chai;Min-shou Zhao
通讯作者：
X. Zhang;D. Sun;W. Yin;Y. Chai;Min-shou Zhao
影响因子：
7.2
作者：
Taizhong Huang;Xianxia Yuan;Jiemei Yu;Zhu Wu;Jitian Han;Guoxin Sun;Naixin Xu;Yihe Zhang
通讯作者：
Taizhong Huang;Xianxia Yuan;Jiemei Yu;Zhu Wu;Jitian Han;Guoxin Sun;Naixin Xu;Yihe Zhang
影响因子：
6.2
作者：
R. Denys;V. Yartys
通讯作者：
R. Denys;V. Yartys
影响因子：
6.6
作者：
Amélie Férey;F. Cuevas;M. Latroche;B. Knosp;P. Bernard
通讯作者：
Amélie Férey;F. Cuevas;M. Latroche;B. Knosp;P. Bernard
DOI：
10.1016/0022-5088(91)90234-u
发表时间：
1991-04
期刊：
Journal of The Less Common Metals
影响因子：
--
作者：
Zhang Deyuan;Jinke Tang;K. Gschneidner
通讯作者：
Zhang Deyuan;Jinke Tang;K. Gschneidner