Growth kinetics of MgH2 nanocrystallites prepared by ball milling  

作　　者：Caiqin Zhou Yayu Peng Qingan Zhang 

机构地区：[1]School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China

出　　处：《Journal of Materials Science & Technology》2020年第15期178-183,共6页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China (No. 51871002)。

摘　　要：MgH2 is one of promising hydrogen storage materials due to its high hydrogen capacity of 7.6 wt%.However,MgH2 nanocrystallites easilygrow up during hydrogen absorption-desorption cycling,leading to deterioration of hydrogen storage properties.To clarify the growth kinetics of MgH2 crystallites,the growth characteristics of MgH2 nanocrystallites are investigated in this work.The growth exponents of MgH2 nanocrystallites in pure MgH2 and MgH2-10 wt% Pr3 Al11 samples are evaluated to be n=5 and n=6,respectively.Meanwhile,their activation energies for crystallite growth are also determined to be109.2 and 144.2 kJ/mol,respectively.The increase of growth exponent and rise of activation energy for crystallite growth in MgH2-10 wt% Pr3 Al11 composite are ascribed to the presence of nano-sized Pr3 Al11phase.

关 键 词：Magnesium hydride Crystallite growth kinetics NANOCRYSTALLITE Pinning effect 

分 类 号：TB383.1[一般工业技术—材料科学与工程]