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Related Experiment Video

Updated: Jan 24, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Tunable Negative Thermal Expansion in Fe/Cr-Substituted Nd₂Co₁₇ Compounds via Magnetoelastic Coupling.

Jiayuan Li^1,2, Chenfei Qv², Haoran Tu¹

¹Center for Neutron Scattering and Advanced Light Source Science and Technology, Dongguan University of Technology, Dongguan, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|January 23, 2026

Summary

We developed a new magnetoelastic method to control thermal expansion in rare-earth intermetallic compounds. This approach enables tunable positive and negative thermal expansion (NTE) for high-precision applications.

Keywords:

controllable thermal expansion magnetic phase transition magnetoelastic coupling

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Area of Science:

Materials Science
Condensed Matter Physics
Magnetism

Background:

Precisely tunable thermal expansion is critical for high-precision applications.
Achieving bidirectional switching between positive and negative thermal expansion (NTE) through composition control remains a challenge.

Purpose of the Study:

To present a magnetoelastic approach for tailoring anisotropic thermal expansion in Nd2(Co1-xFex)17-yCry compounds.
To investigate the composition-dependent switching between positive and negative thermal expansion.

Main Methods:

Synchrotron X-ray diffraction was used to study the lattice response.
Compositional tuning of Nd2(Co1-xFex)17-yCry compounds was performed.
Critical exponent analyses were conducted near the Curie temperature (TC).

Main Results:

Fe-rich compositions exhibited uniaxial NTE along the c-axis (αc = -5.23 × 10^-6 K^-1) below TC.
This NTE is attributed to strong magnetoelastic coupling and enhanced negative exchange interactions.
Compositional tuning suppressed the volume expansion coefficient and modulated TC (442–625 K).

Conclusions:

A new strategy for achieving zero or near-zero thermal expansion in rare-earth intermetallics was established.
These materials show promise for precision thermal management applications.
The findings highlight the role of magnetoelastic coupling and magnetic interactions in controlling thermal expansion.