Correlation between Fe content and z value in Sm(CobalFexCu0.06Zr0.025)z permanent magnets

Add time:07/12/2019    Source:sciencedirect.com

Correlation between Fe content and z value on the structural and magnetic properties of the Sm(CobalFexCu0.06Zr0.025)z magnets (x = 0.20, 0.25, 0.28, and z = 7, 9.5) has been investigated. It is found that the cellular phases in the magnets grow up with increasing Fe content, so the cell boundary phases could hardly form well without enough Sm atoms, resulting in coercivity decreasing. After supplement of Sm content by decreasing z value, cell boundary phases formed continuously, and coercivity was strongly enhanced due to the remarkable concentration gradient of Cu between the 1:5H cell boundary phase and 2:17R cellular phase. It is thus suggested that as the Fe content increases, the z value of magnets need reducing simultaneously in order to keep high coercivity of the magnets.

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