Abstract
The thermal transformations and crystal structures in the ordered bcc phases appearing in Ni2−xMnSb alloys have been investigated. Thermo-analyses on NiMnSb(x = 1) show three λ-shaped peaks suggesting a magnetic and chemical ordering transitions at approximately 450, 865 and 965 °C. With decreasing x, the first and second peak temperatures gradually decrease, while the third one increases. By Z-contrast imaging technique, it was confirmed that the second peak corresponds to the order-disorder transition of vacancies from the L21 to the C1b structure.
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