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Paper Titles
Entropy Changes in Ferromagnetic Shape Memory Alloys
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Stress-Temperature Phase Diagram of Ni2MnGa and Structural Relations between its Constituent Phases
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Neutron Diffraction Studies of Magnetic Shape Memory Alloys
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Influence of Long-Range Atomic Order on the Structural and Magnetic Properties of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys
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Crystal Structures of Modulated Martensitic Phases of FSM Heusler Alloys
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Magnetic Microstructure Analysis of Ferromagnetic Shape Memory Alloys and Related Compounds
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Polycrystalline Ni-Mn-Ga as a Potential Material for Magnetically Driven Actuators
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Crystal Structures of Modulated Martensitic Phases of FSM Heusler Alloys

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Abstract:

Multifunctional ferromagnetic shape memory Heusler alloys are frequently characterized by structural modulation in martensitic phases. In particular, modulated martensitic phases, showing the higher magnetic field induced strain (MFIS) performance, are the most promising candidates for technological applications. Depending on the composition, as well as pressure and temperature conditions, this periodic structural distortion, consisting of shuffling of atomic layers along defined crystallographic directions, accompanies the martensitic transformation. Over the years, different Ni-Mn-Ga modulated martensitic structures have been observed and classified depending upon the periodicity of corresponding ideal nM superstructure (where n indicates the number of basic unit cells constituting the superlattices). On the other hand, it has been demonstrated that in most cases such structural modulation is incommensurate and the crystal structure has been fully determined by applying superspace formalism. The results, obtained by structure refinements on powder diffraction data, suggest a unified crystallographic description of the modulated martensitic structures, here presented, where every different “nM” periodicity can be straightforwardly represented.

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Materials Science Forum (Volume 684)

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105-116

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https://doi.org/10.4028/www.scientific.net/MSF.684.105

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Online since:

May 2011

Authors:

Lara Righi, Franca Albertini, Simone Fabbrici, Antonio Paoluzi

Keywords:

Incommensurate Modulations, Martensitic Structure, Powder Diffraction

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