Degradation Behavior of MgB₂ Powders in Different Medium Environment

Abstract:

High purity MgB2 powders were synthesized by solid sintering reaction. The degradation behavior of MgB2 powders in deionized water was investigated. XRD and SEM analysis indicate that the changes of MgB2 are a function of time. XRD patterns show that the lattice constants are increasing with the time, and MgB2 samples mostly contain amorphous phase after water treated. The decomposition reaction equation was obtained based on the IR and mass spectrum results. The changes of MgB2 exposed to the 10%HCl, 10%H2SO4, 10%NaOH, 1%HCl, 1%H2SO4 and 1%NaOH (mole concentration) were also studied. The variation of phase composition and morphology indicate that the small amount of MgB2 has decomposed on some extent. The results show that acid can catalyze the decomposition of MgB2 but inversely alkali inhibits the decomposition. The decomposition reaction is limited in water, acid and alkali for less than 1h, and it could be said that the stability of MgB2 is better under such conditions.

• Periodical: Materials Science Forum (Volume 650)
• Pages: 172-177
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.650.172
• Online since: May 2010
• Authors: Hao Zhu, Shu Mao Wang, Zhi Nian Li, Xiao Peng Liu, Li Jun Jiang
• Keywords: Additive, Degradation, MgB₂, Stability

References

[1] Naval Studies Board: Technology for the United States �avy and Marine Corps. 2000-2035, Becoming a 21st-Century Force, Weapons (National Academy Press, Washington 1997).

DOI: 10.17226/5866

[2] L.Q. Zang, Chinese Journal of Propulsion Technology, 11(1990), p.56.

[3] D.L. Ye: Practical Handbook of Thermodynamics Data of Inorganic Compounds (Metallurgical Industry Press, Beijing 2001).

[4] A.A. Nayeb-Hashemi and J.B. Clark: Phase Diagrams of Binary Magnesium Alloys (ASM International, Ohio, 1988).

[5] Y. Cui, J.E. Iones, A. Beckley, R. Donovan, D. Lishego, E. Maertz, A.V. Pogrebnyakov, P. Orgiani, J.M. Redwing and X.X. Xi, IEEE Trans. Appl. Superconductivity 15(2005), p.224.

DOI: 10.1109/tasc.2005.849763

[6] J. Nagamatsu, N. Nakagawa, T. Muranaka, Y. Zenitani1 and J. Akimitsu, Nature 410(2001), p.63.

[7] M.E. Jones and R.E. Marsh, J. Am. Chem. Soc. 76(1954), p.1434.

[8] E.F. de Oliveira and Y. Hase, Vibrational Spectroscopy 25(2001), p.53.

[9] K. Nakamoto, in: Infrared and Raman Spectra of Inorgnic and Coordination Compounds(Third Edition), edited by D. R. Huang and R. Q. Wang/Chemical Industry Press, Beijing (1986), in press.

[10] C.S. Sundar, A. Bharathi, M. Premila, T.N. Sairam, S. Kalavathi, G.L.N. Reddy, V.S. Sastry, Y. Hariharan and T.S. Radhakrishnan, Cond-mat/0104354.

[11] K.M. Subhedar, R.S. Hyam, V. Ganesan and S.H. Pawar, Physica C 449(2006), p.73.

[12] D.K. Aswal, K.P. Muthe, A. Singh, S. Sen, K. Shah, L.C. Gupta, S.K. Gupta and V.C. Sahni, Physica C 363(2001), p.208.

DOI: 10.1016/s0921-4534(01)00974-1