Stabilization of Martensite and Austenite Phases and Realization of Two-way Martensitic Transition in Co-Ni-Ga Ferromagnetic Shape Memory Alloy Nanoparticles
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912385551302656 |
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| author | Mahata, Debraj Srinivasana, Ananthakrishnan |
| author_facet | Mahata, Debraj Srinivasana, Ananthakrishnan |
| contents | Three sets of Co-Ni-Ga alloy nanoparticles have been synthesized by a template-free chemical route. Structural, morphological, shape memory, and magnetic properties of room temperature martensite (M) phase, dual (M + secondary $γ$) phase and austenite (A) phase Co-Ni-Ga nanoparticles are reported. Temperature-dependent XRD analysis revealed that $Co_{36}Ni_{36}Ga_{28}$ nanoparticles exhibiting a single M phase at room temperature, completely transform to A phase at $\sim1000$ K. Upon cooling to room temperature, the A phase transforms back to single M phase, confirming the two-way martensitic transition in Co-Ni-Ga nanoparticles. Structural analysis shows that the $γ$-phase does not influence the martensitic transition of bi-phasic (M + $γ$) $Co_{41}Ni_{34}Ga_{25}$ nanoparticles. These nanoparticles display saturation magnetization ranging from 2.9 emu/g to 15.3 emu/g at room temperature. The $γ$ phase could be introduced in A phase $Co_{44}Ni_{26}Ga_{30}$ nanoparticles when heated up to 1073 K. Curie temperatures of A and M phases are higher than the martensitic transition temperatures in all the samples, qualifying them as ferromagnetic shape memory alloy nanoparticles. Observation of M $\leftrightarrow$ A phase transition, Co-Ni-Ga nanoparticles with tunable magnetic properties make them excellent candidates for low and high temperature nanoactuators and other ferromagnetic shape memory applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15292 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stabilization of Martensite and Austenite Phases and Realization of Two-way Martensitic Transition in Co-Ni-Ga Ferromagnetic Shape Memory Alloy Nanoparticles Mahata, Debraj Srinivasana, Ananthakrishnan Materials Science Three sets of Co-Ni-Ga alloy nanoparticles have been synthesized by a template-free chemical route. Structural, morphological, shape memory, and magnetic properties of room temperature martensite (M) phase, dual (M + secondary $γ$) phase and austenite (A) phase Co-Ni-Ga nanoparticles are reported. Temperature-dependent XRD analysis revealed that $Co_{36}Ni_{36}Ga_{28}$ nanoparticles exhibiting a single M phase at room temperature, completely transform to A phase at $\sim1000$ K. Upon cooling to room temperature, the A phase transforms back to single M phase, confirming the two-way martensitic transition in Co-Ni-Ga nanoparticles. Structural analysis shows that the $γ$-phase does not influence the martensitic transition of bi-phasic (M + $γ$) $Co_{41}Ni_{34}Ga_{25}$ nanoparticles. These nanoparticles display saturation magnetization ranging from 2.9 emu/g to 15.3 emu/g at room temperature. The $γ$ phase could be introduced in A phase $Co_{44}Ni_{26}Ga_{30}$ nanoparticles when heated up to 1073 K. Curie temperatures of A and M phases are higher than the martensitic transition temperatures in all the samples, qualifying them as ferromagnetic shape memory alloy nanoparticles. Observation of M $\leftrightarrow$ A phase transition, Co-Ni-Ga nanoparticles with tunable magnetic properties make them excellent candidates for low and high temperature nanoactuators and other ferromagnetic shape memory applications. |
| title | Stabilization of Martensite and Austenite Phases and Realization of Two-way Martensitic Transition in Co-Ni-Ga Ferromagnetic Shape Memory Alloy Nanoparticles |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.15292 |