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Zero Thermal Expansion in Magnetic and Metallic Tb(Co,Fe)2 Intermetallic Compounds
Yuzhu Song1, Jun Chen1, Xinzhi Liu2
1Department of Physical Chemistry, University of Science and Technology Beijing , Beijing 100083, China.
Journal of the American Chemical Society
|January 3, 2018
Summary
Researchers discovered zero thermal expansion (ZTE) in magnetic Tb(Co,Fe)2 intermetallic compounds. This rare metallic material exhibits negligible thermal expansion over a wide temperature range, making it promising for advanced applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Zero thermal expansion (ZTE) materials are highly sought after for applications requiring dimensional stability across temperature variations.
- Metallic-based ZTE compounds are particularly rare, presenting a significant challenge in materials development.
- Understanding the interplay between magnetic ordering and lattice dynamics is crucial for designing novel ZTE materials.
Purpose of the Study:
- To report the discovery of zero thermal expansion (ZTE) in a novel class of magnetic intermetallic compounds.
- To investigate the temperature range and characteristics of ZTE in Tb(Co,Fe)2.
- To elucidate the underlying physical mechanisms responsible for the observed ZTE property.
Main Methods:
- Synthesis and characterization of Tb(Co,Fe)2 intermetallic compounds.
- Measurement of thermal expansion coefficients using dilatometry over a wide temperature range (123-307 K).
- Magnetic property measurements and structural analysis to understand the ferrimagnetic ordering and magnetostriction effects.
Main Results:
- Observation of zero thermal expansion (ZTE) in Tb(Co,Fe)2, with a negligible coefficient of thermal expansion (αl = 0.48 × 10-6 K-1) in Tb(Co1.9Fe0.1).
- The compounds exhibit a ferrimagnetic structure with antiparallel alignment of Tb and Co/Fe magnetic moments along the c-axis.
- ZTE arises from a balance between negative spontaneous magnetostriction (from Tb moments) and positive lattice expansion.
Conclusions:
- Tb(Co,Fe)2 compounds demonstrate a rare metallic-based zero thermal expansion (ZTE) property over an exceptionally wide temperature range.
- The ZTE behavior is attributed to the unique interplay of magnetic ordering and lattice dynamics.
- These materials offer potential for applications benefiting from dimensional stability, high electrical, and thermal conductivity.
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