کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1804910 | 1024662 | 2006 | 4 صفحه PDF | دانلود رایگان |

The effect of grain size and distribution on the anisotropy and coercivity of nanocrystalline Nd2Fe14B magnets has been studied by adopting a Gaussian distribution model of grain sizes. The results show that the effective anisotropy Keff and coercivity Hc decrease with reducing average grain size D¯, and the decrease is more rapid when D¯<15nm. The nonideal distribution of grain size results in a further decrease of Keff and Hc. The grain size distribution has greater effect on Keff when D¯>15nm. Taking values of the microstructure constant Pc=0.9 and distribution coefficient σ=0.5, the variation of Hc with D¯ is consistent with published experiment results. The decrease of Hc is mainly attributed to the decrease of Keff. In order to obtain high effective anisotropy and coercivity in nanocrystalline Nd2Fe14B magnets, D¯ should be larger than 15 nm and the grain size distribution should be as centralized as possible.
Journal: Journal of Magnetism and Magnetic Materials - Volume 306, Issue 1, November 2006, Pages 108–111