Influence of Citric Acid and Calcination Temperature on Microstructure of the Nano Precursors of La-Mg Hydrogen Storage Alloy

Abstract:

The nano precursors of La-Mg hydrogen storage alloy have been prepared using citric acid, lanthanum nitrate and magnesium nitrate by so-gel technology. The effect of citric acid and calcination temperature on microstructure of the nano precursors of La-Mg hydrogen storage alloy have been studied by Infrared Radiation (IR), thermogravimetric and differential thermal analysis (TG/DTA), X-ray diffraction analyzer (XRD) and Transmission electron microscopy (TEM). IR results indicate the molar ratio of citric acid to metal cations increases from 1 to 1.3, the amount of citrate increases correspondingly, when the molar ration increases to 1.6, the amount of citrate goes up to maximum. The most appropriate amount of citric acid is 1.6 times that of the metal cations. In addition, the amount of citric acid have little influence on size of grains. XRD and TG/DTA results show that with increase of calcination temperature the amount of impurity phase, La(OH)₃, decreases markedly. Formation of La₂O₃ and MgO two-phase mixture occurred at 950°C. TEM results reveal that the morphology of the particles is almost flake with the size of ~50nm at 950°C and La, Mg, O three elements are observed in each flake.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 1496-1500
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.1496
• Online since: November 2011
• Authors: Da Hui Wang, Ji Hong Xia, Sha Zhang, Yuan Xia
• Keywords: Calcination Temperature, Citric Acid (CA), Microstructure, Nano Precursors

References

[1] Jiang Jianjun, Yongquan Lei and Dalin Sun: Rare Metal Materials and Engineering Vol. 26 (1997), P.14 In Chinese

[2] S.R. Ovshinsky, M.A. Fetcenko and J.Ross : Science Vol. 260 (1993), P. 176

[3] Tetsuo Sakai, Ituki Uehara and Hiroshi Ishikawa :Joural of Alloys and Compounds Vol. 293-295 (1999), P.762

[4] J.J. Reilly, G.D. Adzic and J.R. Johnson : Joural of Alloys and Compounds Vol. 293-295 (1999), P.569

[5] D.M. Kim, K.J. Jang and J.Y. Lee : Joural of Alloys and Compounds Vol. 293-295 (1999), P.583

[6] Y. Chen, C. Sequeira, C.P. Chen et al.: Joural of Alloys and Compounds Vol. 354 (2003), P.120

[7] K. Pal :International Journal of hydrogen Energy Vol. 22 (1997), P.799

[8] K.J. Gross, D. Chartouni and E. Leroy : Joural of Alloys and Compounds Vol. 269 (1998), P.259

[9] B. Darriet, M. Pezat, A. Hbika et al.: International Journal of hydrogen Energy Vol. 5 (1980), P.173

[10] Dahui Wang, Yanping Zhong: Rare Metal Materials and Engineering Vol. 39 (2010), P.27

[11] T.Kohno, H.Yoshida, F.Kawashima et al.: Joural of Alloys and Compounds Vol. 311 (2000), P.L5

[12] Junfeng Liu,Yanghuan Zhang: Battery Bimonthly Vol. 39 (2009), P.181 In Chinese

[13] A.Vadivel Murugan, B.B. Kale and Lalita B.Kunde: Sloid State Electrochem Vol. 10 (2006), P.104

[14] Jingxian Zhang, Xiaoming Tang and Yingliang Liu: Chinese Journal of Inorganic Chemistry Vol. 18 (2002), P.181 In Chinese

[15] Jingxian Zhang, Peng Wang and Wenxin Chen: Journal of Jinan University (Natural Science) Vol. 24 (2003), P.42 In Chinese

[16] Baiyu Qi, Xuanli Han and Rui Zhu. China Rare Earths Vol. 29 (2008), P.53 In Chinese

[17] M.P. Pechini, U.S. Patent 3,330,697. (1967)

[18] M.P. Pechini, U.S. Patent 3,231,328. (1966)