1. 1) G. Yu, Y. Zhang, S. Zheng, X. Zou, X. Wang and Y. Zhang: Trans. Nonferr. Met. Soc. China, 24 (2014), 1918.
2. 2) R. Q. Peng: Nickel Metallurgy, Central South University Press, Changsha, (2005), 87.
3. 3) Z. M. Cao, G. S. Sun, K. Richiter and Z. Y. Qiao: J. Univ. Sci. Technol. Beijing, 23 (2001), 316.
4. 4) F. B. Waanders and J. Nell: Hyperfine Interact., 218 (2013), 101.
5. 5) J. Qiu, G. Li, F. Li, P. Wu and X. Lv: J. Mineral. Petrol., 37 (2017), 1.