Abstract
The crystal structure of a four-layered martensite phase in Ni50Mn37.5Sn12.5 single crystal following various modes of training procedure was examined by high energy synchrotron radiation and high-resolution transmission electron microscopy. Three distinct types of unit cell i.e. 4O, 4M, and 8M were unveiled, depending on the mechanical history of the specimen. The most stable phase turned out to be the 4M martensite. Analysis of the intensity of modulation reflections allowed for defining a periodic atomic displacement of 0.3497 Å. The results support the concept of a periodic atomic shuffling as opposed to the adaptive nanotwining approach.
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