A Material Showing Colossal Positive and Negative Volumetric Thermal Expansion with Hysteretic Magnetic Transition

2017 ◽  
Vol 56 (42) ◽  
pp. 13052-13055 ◽  
Author(s):  
Ji-Xiang Hu ◽  
Yang Xu ◽  
Yin-Shan Meng ◽  
Liang Zhao ◽  
Shinya Hayami ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Magnetic Transition ◽  
Volumetric Thermal Expansion

A Material Showing Colossal Positive and Negative Volumetric Thermal Expansion with Hysteretic Magnetic Transition

2017 ◽  
Vol 129 (42) ◽  
pp. 13232-13235 ◽  
Author(s):  
Ji-Xiang Hu ◽  
Yang Xu ◽  
Yin-Shan Meng ◽  
Liang Zhao ◽  
Shinya Hayami ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Magnetic Transition ◽  
Volumetric Thermal Expansion

THERMAL EXPANSION ANOMALIES AT THE MAGNETIC TRANSITION OF Mn3Ga1-xAlxC (x ≤ 0.05)

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-159-C8-160
Author(s):  
T. Suzuki ◽  
T. Kanomata ◽  
T. Kaneko
Keyword(s):  
Thermal Expansion ◽  
Magnetic Transition

Structure, magnetic properties and thermal expansion of Mn3PtNx (0 ≤ x  ≤ 1.0) compounds

2018 ◽  
Vol 32 (28) ◽  
pp. 1850314 ◽  
Author(s):  
Ruihua Chou ◽  
Ying Sun ◽  
Huiqing Lu ◽  
Guang-Hong Lu
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Nitrogen Content ◽  
Magnetic Transition ◽  
Spin Correlation ◽  
Solid State Reaction Method ◽  
Volume Effect ◽  
Space Group ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

In this work, Mn3PtN[Formula: see text] (x = 0, 0.25, 0.5, 0.75 and 1.0) compounds were prepared by solid state reaction method. The structure, magnetic properties and thermal expansion behaviors of Mn3PtN[Formula: see text] compounds with different nitrogen content were systematically investigated. Mn3PtN has typical antiperovskite cubic structure with space group Pm-3m (221). With decreasing nitrogen content, the crystal structure changes to hexagonal with space group P63/mmc when the value of x decreases to x = 0.25, and then back to cubic with Fm3m at x = 0. All of the obtained Mn3PtN[Formula: see text] compound exhibit the magnetic transition from antiferromagnetic (AFM) to paramagnetic (PM). Moreover, another transition from AFM1 to AFM2 at lower temperature was also observed in Mn3Pt. The experimental results indicate that the magnetic transition induced abnormal thermal expansion behavior in Mn3PtN[Formula: see text]. Especially, a typical giant thermal expansion behavior of about [Formula: see text]8‰ volume change arising from the magneto-volume effect at 411 K is observed in Mn3Pt compound. The obtained results imply that this kind of compounds is a strong lattice–spin correlation system.

scholarly journals Coherent spin rotation-induced zero thermal expansion in MnCoSi-based spiral magnets

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jun Liu ◽  
Bei Ding ◽  
Yuan Yao ◽  
Xuekui Xi ◽  
Zhenxiang Cheng ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Magnetic Transition ◽  
Negative Thermal Expansion ◽  
Spin Rotation ◽  
Crystalline Lattice ◽  
Spin Order ◽  
Transmission Electron ◽  
Spiral Magnetic Structure ◽  
Lorentz Transmission Electron Microscopy ◽  
Increasing Temperature

AbstractMaterials exhibiting zero thermal expansion (ZTE), namely, volume invariance with temperature change, can resist thermal shock and are highly desired in modern industries for high-precision components. However, pure ZTE materials are rare, especially those that are metallic. Here, we report the discovery of a pure metallic ZTE material: an orthorhombic Mn1-xNixCoSi spiral magnet. The introduction of Ni can efficiently enhance the ferromagnetic exchange interaction and construct the transition from a spiral magnetic state to a ferromagnetic-like state in MnCoSi-based alloys. Systematic in situ neutron powder diffraction revealed a new cycloidal spiral magnetic structure in the bc plane in the ground state, which transformed to a helical spiral in the ab plane with increasing temperature. Combined with Lorentz transmission electron microscopy techniques, the cycloidal and helical spin order coherently rotated at varying periods along the c-axis during the magnetic transition. This spin rotation drove the continuous movement of the coupled crystalline lattice and induced a large negative thermal expansion along the a-axis, eventually leading to a wide-temperature ZTE effect. Our work not only introduces a new ZTE alloy but also presents a new mechanism by which to discover or design ZTE magnets.

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