Substitutes

Substitutes and Alternatives for Samarium

The availability of viable substitutes is a key factor in assessing Samarium's criticality. Across its 2 primary applications, substitution options range from commercially viable alternatives with performance trade-offs to applications where Samarium currently has no effective substitute.

Substitution Analysis by Application

The following table details available substitutes for Samarium across its primary applications, including the trade-offs involved:

Performance Trade-offs

In most applications, substituting Samarium involves measurable performance penalties. NdFeB magnets with heavy rare earth additions can operate to ~200C; SmCo operates to 300-350C without demagnetizing; SmCo is essential for jet engine applications and satellite components where NdFeB fails. In high-performance applications such as samarium-cobalt permanent magnets, these trade-offs can be particularly significant.

Research and Development

Active research programs are underway to develop improved substitutes and to reduce the amount of Samarium required per unit of product (thrifting). However, timelines for commercializing new alternatives typically span years to decades. The limited substitutability of Samarium is a primary driver of its high criticality rating, prompting government-funded substitution research programs.