Stacking Faults and a Novel Structural Polytype in a Hydrogen-Storage (La<SUB>0.8</SUB>Mg<SUB>0.2</SUB>)Ni<SUB>3.5</SUB> Alloy with Block-Stacking Superstructures
Abstract:We investigated the microstructure of a hydrogen-storage (La 0:8 Mg 0:2 )Ni 3:5 alloy with block-stacking superstructures by electron diffraction and Z-contrast scanning transmission electron microscopy (STEM), particularly focusing on the type of stacking fault structures and possible occurrence of novel structural variants. It was found that two major phases coexist in the alloy, which are of 5:19-2H type and 5:19-3R type superstructures that are constructed by the common structural blocks but with different… Show more
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