Magnetic-Field-Induced Strong Negative Thermal Expansion in La(Fe,Al)13
Source abstract
Abstract
Negative thermal expansion (NTE) plays an increasingly important role in the control of thermal expansion of materials. However, the discovery of strong NTE materials, which is rare, remains challenging. In this study, a strong NTE (αl = −14.01 × 10–6 K–1) has been achieved in La(Fe11.5Al1.5) by a new method of loading magnetic field, which is different from the conventional method of chemical modification. The strong NTE of La(Fe11.5Al1.5) originates from the enhanced ferromagnetic (FM) component induced by the magnetic field-driven spin-moment rotation of the canting structure, which has been revealed by the magnetic field and temperature dependence of neutron powder diffraction and small-angle neutron scattering. Furthermore, the hidden short-range FM order facilitates a wider NTE temperature range in La(Fe11.5Al1.5). This study provides the possibility that an external environment, such as a magnetic field, can be an effective approach to control or achieve strong NTE in functional materials.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Thermal Expansion and Ionic Conductivity · Magnetic and transport properties of perovskites and related materials · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Beijing Advanced Innovation Center for Materials Genome Engineering, and School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Funding
the State Key Lab of Advanced Metals and Materials
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