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Structure and magnetic properties of Pr2Fe14(C, B)/α-(Fe, Co)-type nanocomposite ribbons

Li An-Hua Lai Bin Wang Hui-Jie Zhu Ming-Gang Li Wei

Structure and magnetic properties of Pr2Fe14(C, B)/α-(Fe, Co)-type nanocomposite ribbons

Li An-Hua, Lai Bin, Wang Hui-Jie, Zhu Ming-Gang, Li Wei
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  • Received Date:  13 April 2010
  • Accepted Date:  26 May 2010
  • Published Online:  05 January 2011

Structure and magnetic properties of Pr2Fe14(C, B)/α-(Fe, Co)-type nanocomposite ribbons

  • 1. Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081,China

Abstract: The phase evolution, microstructure and magnetic properties of PrxFe82-x-yTiyCo10B4C4 (x=9—10.5; y=0, 2) melt-spun ribbons have been investigated. All ribbons are mainly comprised of the 2 ∶14 ∶1, 2 ∶17 and α-(Fe, Co) phases. For the group of Ti-free ribbons (y=0), the coercivity increases with increasing x while the remanence decreases with increasing x. When 2 at.%Ti is substituted for Fe in the Ti-free ribbons, the magnetic properties are remarkably enhanced. The coercivity and squareness of demagnetization curve of the Ti-substitution ribbons are substantially improved without a sacrifice of remanence (except for x=9), the remanence even obviously increases at x=10.5. The optimal magnetic properties of Br=9.6 kGs (1 Gs=10-4T), iHc =10.2 kOe (1 Oe=79.5775 A/m), (BH)max=17.4 MGOe have been obtained in Ti-substituted Pr10.5Fe69.5Ti2Co10B4C4 group. The volume fraction of the 2 ∶14 ∶1 phase increases with increasing x, which leads to an increase of coercivity. Ti-substitution suppresses the grain growth of α-(Fe, Co) phase during annealing process, which makes the volume ratio of magnetically hard phase and soft phase and grain size tend to have optimal values, and the intergranular exchange coupling substantially enhances.

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