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- W3124677659 abstract "Nd 2 Fe 14 B-based magnetic powders are essential in many applications. In this work, Nd 2 Fe 14 B hard magnetic particles were synthesised via hydrothermal techniques following a reduction–diffusion annealing process. The mechanism of Nd 2 Fe 14 B-particles formation was investigated via differential-scanning calorimetry and X-ray-diffraction; the results showed that Nd–Fe–B precursors of well-dispersed nanometre size were successfully synthesised via a hydrothermal reaction. The Nd–Fe–B oxides were composed of Fe 2 O 3 , NdFeO 3 and NdBO 3 (annealing at 900 °C) or amorphous B m O n (annealing at 700 and 800 °C). Reduction–diffusion (R–D) was a four-step process: first, the reduction of Fe 2 O 3 to Fe occurred at 328 °C; second, NdBO 3 was reduced to B and NdH 2 at 341 °C; third, NdH 2 and Fe were formed from NdFeO 3 at 635 °C; and finally, the Nd 2 Fe 14 B phase was formed from NdH 2 , Fe and B at 659 °C. After removing the main by-product CaO, the coercivity of the as-synthesised Nd 2 Fe 14 B-based powder was 2.0 kOe. Analysis of the temperature-dependent magnetic properties revealed that coercivity was controlled by nucleation of the reversed magnetic domains. • Nd 2 Fe 14 B magnetic particles was synthesised by hydrothermal method. • The evolution process of Nd 2 Fe 14 B particle was investigated via DSC and XRD • The mechanism of the coercivity were studied." @default.
- W3124677659 created "2021-02-01" @default.
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- W3124677659 date "2021-04-01" @default.
- W3124677659 modified "2023-09-27" @default.
- W3124677659 title "The reaction mechanism in the hydrothermal synthesis of Nd2Fe14B magnetic particles" @default.
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- W3124677659 doi "https://doi.org/10.1016/j.jssc.2021.122003" @default.
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