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• W4288050254 abstract "The effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties of the Mn1−xCoxNiGe system have been investigated. Cobalt doping on the Mn site shifted the martensitic structural transition toward lower temperature until it was ultimately absent, leaving only a magnetic transition from a ferromagnetic (FM) to a paramagnetic (PM) state in the high-temperature hexagonal phase. Co-occurrence of the magnetic and structural transitions to form a first-order magnetostructural transition (MST) from the FM orthorhombic to the PM hexagonal phase was observed in samples with 0.05 &lt; x &lt; 0.20. An additional antiferromagnetic–ferromagnetic-like transition was observed in the martensite phase for 0.05 &lt; x &lt; 0.10, which gradually vanished with increasing Co concentration (x &gt; 0.10) or magnetic field (H &gt; 0.5 T). The application of external hydrostatic pressure shifted the structural transition to lower temperature until an MST was formed in samples with x = 0.03 and 0.05, inducing large magnetic entropy changes up to −80.3 J kg−1 K−1 (x = 0.03) for a 7-T field change under 10.6-kbar pressure. Similar to the effects of the application of hydrostatic pressure, an MST was formed near room temperature in the sample with x = 0.03 by annealing at high temperature (1200 °C) followed by quenching, resulting in a large magnetic entropy change of −56.2 J kg−1 K−1. These experimental results show that the application of pressure and thermal quenching, in addition to compositional variations, are effective methods to create magnetostructural transitions in the MnNiGe system, resulting in large magnetocaloric effects." @default.
• W4288050254 created "2022-07-28" @default.
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• W4288050254 date "2022-07-27" @default.
• W4288050254 modified "2023-10-14" @default.
• W4288050254 title "Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn_1−<i>x</i>Co_<i>x</i>NiGe" @default.
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• W4288050254 doi "https://doi.org/10.1063/5.0100987" @default.
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