Research Highlights

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High-strength, high temperature bonded magnets

CMI researchers at Oak Ridge National Laboratory and Ames Laboratory collaborated on the research for this CMI highlight on high-strength, high temperature NdFeB PPS bonded magnets

Magnetic hysteresis loops of AM fabricated NdFeB PPS bonded PM at room temperature. Sample ID: 1.1- as printed; 1.2-uncoated (dipped in pH 1.35 solution for 24 h), 1.3- coated with 3M ScotchWeld DP100 (dipped in pH 1.35 solution 24 h), 1.4- uncoated (aged at 80 °C; 95% RH; > 120 h), 1.5- coated with 3M ScotchWeld DP100 (80 °C; 95% RH; > 100 h) (bottom). Note the improved performance of the coated samples 1.3 and 1.5 relative to the uncoated samples 1.2 and 1.4.

Potential Alnico-surpassing gap magnet

CMI researchers at Iowa State University, Ames Laboratory and UC-Davis collaborated with researchers at the University of Nebraska at Lincoln for this highlight on a potential Alnico-surpassing gap magnet

Easy and hard-axis magnetic field sweeps in (Fe1-xCox)2B, x= 0.3, depicting a significant uniaxial anisotropy field of 0.6 Tesla. Anisotropy field at 500 K (not shown) essentially unchanged.

Electrolyte design for separation of rare earth metals (Pr & Nd)

CMI researchers at Idaho National Laboratory worked with OLI Systems to create an electrolyte design for separation of rare earth metals (Pr & Nd)

0.0375 M Pr acetate, 0.0375 M Nd acetate, 0.2 M lithium tartrate (a) before dissolution of precipitate (b) after adjusting pH.

Improving alnico magnets using thermomagnetic processing

CMI researchers at Ames Laboratory and Oak Ridge National Laboratory demonstrated increases in coercivity and energy product and tuning of phase transformation temperatures in alnico using high magnetic field processing

Demonstration of increases in both coercivity and energy product of alnico when heat treated in a magnetic field.

Finite Element Model for mechanical properties of SmCo5

CMI research conducted at Ames Laboratory developed a finite-element (FE) model for a SmCo5 magnet matrix with Sm2O3 impurities. The results accurately predict the stress distribution from a three-point bend analysis to identify domains of stress concentration and failure.

FEM vs. Microstructural model, showing the stress-strain relationship to be accurately captured by the computationally less intensive FEM model. This allows for very rapid assessments of mechanical properties of novel architectures.

Magnetically aligned electrodes predicted to increase lithium-ion battery capacity by as much as 25%

CMI research at Ames Laboratory developed a coupled electrochemical-thermal-mechanical model to predict the electrochemical degradation and performance of magnetically aligned electrodes in lithium-ion batteries for fast-charging applications

Capacity gain vs. relative tortuosity. Note the more than 25% gain at low tortuosity for the high charging rate 4C.

Topological Electronic Control by Quantum Periodic Motion

Imposing vibrational coherence into topological states may become a universal light control principle for reinforcing protected quantum transport.

Illustration of topological control by quantum periodic motion

Dark-state-based low-loss dual-response metasurfaces

Hybrid dark-state metasurfaces achieved separate implementation of resonance and electromagnetic response, enabling more versatile and configurable metamaterials.

Determining the Edge Termination of h-BN Nanosheets

Identifying the functional groups that passivate the edges of exfoliated h-BN nanosheets will facilitate the development of this important 2D nanomaterial.

Unexpected Discharge Mechanism in Selenium Batteries

Advanced TEM, SSNMR, and electroanalytical techniques revealed that the sodiation mechanism of selenium in microporous carbon is unexpectedly inhomogeneous, both spatially and in terms of composition. These combined findings highlight the complex phenomenology of electrochemical phase transformations in nanoconfined materials, which may profoundly differ from their “free” counterparts.

Illustration of sodiation in a selenium battery