Lanthanum-nickel alloy explained

Lanthanum forms several alloys with nickel, including LaNi₅, La₂Ni₇, LaNi₂, LaNi₃, La₂Ni₃, LaNi and La₃Ni etc.^[1]

LaNi₅

See main article: article.

LaNi₅ is an intermetallic compound with a CaCu₅ structure. It belongs to the hexagonal crystal system.^[2] It can be oxidized by air above 200 °C, and react with hydrochloric acid, sulfuric acid or nitric acid above 20 °C.^[3] LaNi₅ can be used as a catalyst for hydrogenation reactions.^{[4] [5]}

Other alloys

In addition to LaNi₅, there are other alloys such as La₂Ni₇, LaNi₂, LaNi₃, La₂Ni₃, LaNi, and La₃Ni, and nonstoichiometric alloys such as LaNi_2.286 (tetragonal, space group I4̄2m).^[6] The nickel atoms in La_xNi_y can also be replaced by other atoms, such as LaNi_2.5Co_2.5.^[7]

See also

• List of named alloys

Notes and References

1. Picard, G. S.; Mottot, Y. E.; Tremillon, B. L. Study on electrowinning of solid lanthanum-nickel alloys in lithium chloride-potassium chloride eutectic melt. Proceedings - Electrochemical Society, 1984. 84-2. pp 585-602.
2. Zhang . Yang-huan . Li . Peng-xin . Yang . Tai . Zhai . Ting-ting . Yuan . Ze-ming . Guo . Shi-hai . December 2014 . Effects of substituting La with M (M=Sm, Nd, Pr) on electrochemical hydrogen storage characteristics of A2B7-type electrode alloys . Transactions of Nonferrous Metals Society of China . en . 24 . 12 . 4012–4022 . 10.1016/S1003-6326(14)63563-9.
3. Goncharuk, A. B.; Endrzheevskaya, S. N. Stability of lanthanum nickel (LaNi₅) intermetallide in liquid and gaseous media. Poroshkovaya Metallurgiya (Kiev), 1980. 8: 77-79
4. Imamura . Hayao . Kato . Yuzo . Yamada . Kazuhiro . Tsuchiya . Susumu . January 1986 . Preparation and properties of raney catalysts from rare earth intermetallic compounds . Applied Catalysis . en . 27 . 2 . 243–256 . 10.1016/S0166-9834(00)82921-8.
5. 吴富英, 安越, 宋林,等. 氟处理后的镧镍五对乙基咔唑的催化加氢性能[J]. 化学反应工程与工艺, 2015, 31(5):407-411.
6. Structure of LaNi2.286 and the La-Ni system from LaNi1.75 to LaNi2.50. 1. 10.1016/0022-5088(88)90357-8. 133–141. 144. Journal of the Less Common Metals. November 1988. 0022-5088. 2018-11-27. A.V. Klimyenko, J. Seuntjens, L.L. Miller, B.J. Beaudry, R.A. Jacobson, K.A. Gschneidner. 2019-08-31. https://web.archive.org/web/20190831191008/https://linkinghub.elsevier.com/retrieve/pii/0022508888903578.
7. Sakai T, Miyamura H, Kuriyama N, et al. The influence of small amounts of added elements on various anode performance characteristics for LaNi₂. 5Co₂. 5-based alloys[J]. Journal of the Less common Metals, 1990, 159: 127-139.