Lower-cost commercial grade Ce enhances performance and reduces cost in gap magnets

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CMI scientists at Ames Laboratory conducted this research.

Achievement

The less costly “dirty” cerium samples showed as much as a 5% increase of both coercivity and magnetization resulting also in better energy product.

Significance and impact

This promising result will significantly  lower the production costs of the Ce-based “gap magnet,” yielding substantially increased commercialization opportunities.

Details and next steps

  • Commercial Cerium of 99.9% purity was used instead of laboratory-grade high purity (99.99%) Cerium
  • Next steps involve the detailed microscopical investigation and clarification of the phenomenon,  which may involve an Fe, Co grain boundary phase
Demagnetization curves and energy products of the Zr-doped Ce-based gap magnet with “dirty” (grey) and high-purity (red) cerium; (b) – FE-SEM back scattered images of “clean” and “dirty” samples, showing development of additional grain boundaries enriched with Fe, Co-rich phase.
Demagnetization curves and energy products of the Zr-doped Ce-based gap magnet with “dirty” (grey) and high-purity (red) cerium; (b) – FE-SEM back scattered images of “clean” and “dirty” samples, showing development of additional grain boundaries enriched with Fe, Co-rich phase.