Microstructure and kinetics of Cu/Y2O3-doped MgB2



Publication Details

Cai, Q., Liu, Y., Ma, Z., Gao, Z. & Yu, L. (2012). Microstructure and kinetics of Cu/Y2O3-doped MgB2. Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment, 33 (9), 7-12.


Cu/Y 2O 3-doped MgB 2 samples with different Y 2O 3 content were prepared by traditional solid-state sintering method. The microstructure and phase composition of the material were analyzed by SEM and X-ray diffraction. The results show that layered structure only appeares in Cu/5%Y 2O 3-doped sample. The solid-solid reaction of this system is further investigated by kinetics analysis in terms of thermal analysis curves. Finally, the most appropriate mechanism function is ascertained to be Avrami-Erofeev, n=2, which means random nucleation followed by instantaneous growth of nuclei. The activation energy (E) and the pre-exponential factor (A) both trend to be stable at early stage and decrease at final stage.

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