Fitexc – Diffraction Profile Fitting Program Run in MS Excel

Veřtát, Petr; Drahokoupil, Jan

doi:10.14311/app.2018.17.0020

Cited by 1 publication

(1 citation statement)

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“…This ensures that the magnitude of the modulation vector is independent on the thermal expansion. Measured reflections were fitted employing the custom-made programme FitExc [71]. To distinguish and match contributions from different mosaic blocks for each reflection (of the martensitic phases), the data were fitted using multiple peaks, allowing a precise calculation of the modulation vector.…”

Section: X-ray and Neutron Diffractionmentioning

confidence: 99%

Hysteretic structural changes within five-layered modulated 10M martensite of Ni–Mn–Ga(–Fe)

Veřtát

Seiner

Straka

et al. 2021

J. Phys.: Condens. Matter

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Modulated structure of Ni–Mn–Ga-based alloys is decisive in their magnetic shape memory (MSM) functionality. However, the precise nature of their five-layered modulated 10M martensite is still an open question. We used x-ray and neutron diffraction experiments on single crystals to investigate structural changes within 10M-modulated martensite of the Ni50Mn27Ga22Fe1 MSM alloy. The modulation vector gradually increases upon cooling from commensurate q = (2/5) g 110, where g 110 is the reciprocal lattice vector, to incommensurate with q up to pseudo-commensurate q = (3/7) g 110. Upon heating, reverse changes are observed with a thermal hysteresis of ≈60 K. The same hysteretic behaviour was detected in the electrical resistivity and the effective elastic modulus. Scanning electron microscopy showed that the changes are accompanied by the refinement of the a/b laminate. These observations indicate that the commensurate state is a metastable form of 10M martensite. Upon cooling, this phase evolves through nanotwinning into a more irregular and more stable incommensurate structure.

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Section: X-ray and Neutron Diffractionmentioning

confidence: 99%