Negative Thermal Expansion in the Materials With Giant Magnetocaloric Effect

Hu, Fengxia; Shen, Fang; Hao, Jiazheng; Liu, Yao; Wang, Jing; Sun, J. R.; Shen, Baogen

doi:10.3389/fchem.2018.00438

Cited by 27 publications

(11 citation statements)

References 80 publications

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“…Similar correlations are observed in Gd 5 (Si x Ge 1−x ) 4 alloys [320]. In addition, magnetic transformations are often accompanied by an abnormal thermal expansion [139,321,322]. The caloric effect also scales with the total entropy change.…”

Section: Correlated Physical Propertiessupporting

confidence: 65%

Viable Materials with a Giant Magnetocaloric Effect

Zarkevich

Zverev

2020

Crystals

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This review of the current state of magnetocalorics is focused on materials exhibiting a giant magnetocaloric response near room temperature. To be economically viable for industrial applications and mass production, materials should have desired useful properties at a reasonable cost and should be safe for humans and the environment during manufacturing, handling, operational use, and after disposal. The discovery of novel materials is followed by a gradual improvement of properties by compositional adjustment and thermal or mechanical treatment. Consequently, with time, good materials become inferior to the best. There are several known classes of inexpensive materials with a giant magnetocaloric effect, and the search continues.

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Section: Correlated Physical Propertiessupporting

confidence: 65%

Viable Materials with a Giant Magnetocaloric Effect

Zarkevich

Zverev

2020

Crystals

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“…S6 and S7 of the Supplemental Material) is negative in MnPtGa, which is somewhat unusual in Mnbased intermetallics. Often, magnetic ordering leads to expanded volume in such systems, as magnetism favors localization of the itinerant electrons [11,[29][30][31][32][33][34][35]. However, in a few cases negative volume magnetostriction has been reported, such as in the antiferromagnets MnO and MnS [36] and the magnetocalorics Mn 5 Ge 3 [37] and Mn 1+x Sb [38].…”

Section: B Magnetic Property Characterizationmentioning

confidence: 99%

Evolution of noncollinear magnetism in magnetocaloric MnPtGa

Cooley

Bocarsly

Schueller

et al. 2020

Phys. Rev. Materials

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MnPtGa crystallizes in the hexagonal Ni2In structure type in space group P 63/mmc, and has been reported to display a ferromagnetic Curie temperature near 220 K. Here we find a transition near TC = 236 K to a ferromagnetic state, albeit with a reduced moment from what is expected for collinear ordering. The peak magnetocaloric entropy change was determined to be ∆SM = −1.9 J kg −1 K −1 for an applied magnetic field of H = 5 T at the ferromagnetic ordering temperature. Magnetostructural coupling manifests as a change in the slope of the thermal expansion coefficients of the c lattice parameter near TC , with a negative spontaneous volume magnetostriction; ω = −300 ppm at 190 K. Neutron powder diffraction studies of the magnetic ground state reveal an evolution in complexity as temperature decreases: from a ferromagnet, to a canted antiferromagnet, to the eventual formation of a spin-density wave state at low temperatures.

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“…Due to its structural origin, they are generally present over a broad temperature range. The other type of NTE is driven by phase transitions, with underlying phenomena like charge transfer [44], ferroelectric order [45], magnetic and orbital ordering [46], and giant magnetocaloric effect [47] being responsible. Interestingly, many oxides like LaMnO 3 [7,8], SrRuO 3 [9], and AlFeO 3 [12] exhibit this type of NTE.…”

Section: Resultsmentioning

confidence: 99%

Phase coexistence and negative thermal expansion in the triple perovskite iridate Ba3CoIr2O9

Garg

Cervellino

Nair

2021

Phys. Rev. Materials

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The anomalous thermal expansion in a layered 3d-5d based triple perovskite iridate Ba 3 CoIr 2 O 9 is investigated using high resolution synchrotron diffraction. Below the magnetostructural transition at 107 K, the onset of antiferromagnetic order is associated with a monoclinic distortion of the hexagonal structure. Deeper within the magnetically ordered state, a part of the monoclinic phase distorts even further, and both these structural phases co-exist down to the lowest measured temperatures. We observe negative thermal expansion in this phase co-existence regime, which appears to be intimately connected to the temperature driven relative fractions of these monoclinic phases. The significant NTE observed in this system could be driven by magnetic exchange striction and is of relevance to a number of systems with pronounced spin orbit interactions.

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Negative Thermal Expansion in the Materials With Giant Magnetocaloric Effect

Cited by 27 publications

References 80 publications

Viable Materials with a Giant Magnetocaloric Effect

Viable Materials with a Giant Magnetocaloric Effect

Evolution of noncollinear magnetism in magnetocaloric MnPtGa

Phase coexistence and negative thermal expansion in the triple perovskite iridate Ba3CoIr2O9

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