A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy

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Abstract Martensitic transformation in a highly ordered Fe 3 Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe 3 Pt with a degree of order S  = 0.88. The tetragonality c / a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c / a

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