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Strain behavior and lattice dynamics in Ni50Mn35In15
C Salazar Mejía1, A K Nayak, J A Schiemer
1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 30, 2015
Summary
Resonant ultrasound spectroscopy reveals lattice dynamics in Ni50Mn35In15 Heusler alloy. The study details structural softening and stiffening during martensitic transitions and magnetoelastic coupling.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Physics
Background:
- Heusler alloys are crucial in materials science due to their unique magnetic and structural properties.
- Understanding lattice dynamics is key to predicting and controlling shape-memory effects in these alloys.
Purpose of the Study:
- To investigate the lattice dynamics of the polycrystalline shape-memory Heusler alloy Ni50Mn35In15.
- To analyze the temperature dependence of elastic moduli and acoustic attenuation.
- To correlate acoustic properties with magnetic transitions.
Main Methods:
- Resonant Ultrasound Spectroscopy (RUS) was employed to study lattice dynamics.
- RUS spectra were acquired over a wide frequency range (100-1200 kHz).
- Measurements were conducted across a broad temperature spectrum (10-350 K).
Main Results:
- Ni50Mn35In15 exhibits distinct magnetic transitions: ferromagnetic at 313 K (austenite) and paramagnetic to ferrimagnetic within the martensitic phase.
- A significant structural softening precedes the martensitic transition, followed by lattice stiffening at the magneto-structural transition.
- Acoustic damping is pronounced in the martensitic phase due to twin wall motion, decreasing at lower temperatures.
Conclusions:
- The study elucidates the complex interplay between structural, magnetic, and elastic properties in Ni50Mn35In15.
- Lattice dynamics are strongly influenced by martensitic and magnetic transitions.
- Weak magnetoelastic coupling was observed at Curie temperatures in both austenite and martensite phases.
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