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Magnetostructural Coupling Drives Magnetocaloric Behavior: The Case of MnB versus FeB

Bocarsly, Joshua D. ; Levin, Emily E. ; Humphrey, Samuel A. ; Faske, Tom ; Donner, Wolfgang ; Wilson, Stephen D. ; Seshadri, Ram (2019)
Magnetostructural Coupling Drives Magnetocaloric Behavior: The Case of MnB versus FeB.
In: Chemistry of Materials, 31 (13)
doi: 10.1021/acs.chemmater.9b01476
Article, Bibliographie

Abstract

Materials with strongly coupled magnetic and structural transitions can display a giant magnetocaloric effect, which is of interest in the design of energy-efficient and environmentally friendly refrigerators, heat pumps, and thermomagnetic generators. There also exist, however, a class of materials with no known magnetostructural transition that nevertheless show remarkable magnetocaloric effects. MnB has been recently suggested as such a compound, displaying a large magnetocaloric effect at its Curie temperature (570 K) showing promise in recovering low-grade waste heat using thermomagnetic generation. In contrast, we show that isostructural FeB displays very similar magnetic ordering characteristics, but is not an effective magnetocaloric. Temperature- and field-dependent diffraction studies reveal dramatic magnetoelastic coupling in MnB, which exists without a magnetostructural transition. No such behavior is seen in FeB. Furthermore, the magnetic transition in MnB is shown to be subtly first-order, albeit with distinct behavior from that displayed by other magnetocalorics with first-order transitions. Density functional theory-based electronic structure calculations point to the magnetoelastic behavior in MnB as arising from a competition between Mn moment formation and B–B bonding.

Item Type: Article
Erschienen: 2019
Creators: Bocarsly, Joshua D. ; Levin, Emily E. ; Humphrey, Samuel A. ; Faske, Tom ; Donner, Wolfgang ; Wilson, Stephen D. ; Seshadri, Ram
Type of entry: Bibliographie
Title: Magnetostructural Coupling Drives Magnetocaloric Behavior: The Case of MnB versus FeB
Language: English
Date: 20 June 2019
Publisher: American Chemical Society
Journal or Publication Title: Chemistry of Materials
Volume of the journal: 31
Issue Number: 13
DOI: 10.1021/acs.chemmater.9b01476
URL / URN: https://pubs.acs.org/doi/10.1021/acs.chemmater.9b01476
Abstract:

Materials with strongly coupled magnetic and structural transitions can display a giant magnetocaloric effect, which is of interest in the design of energy-efficient and environmentally friendly refrigerators, heat pumps, and thermomagnetic generators. There also exist, however, a class of materials with no known magnetostructural transition that nevertheless show remarkable magnetocaloric effects. MnB has been recently suggested as such a compound, displaying a large magnetocaloric effect at its Curie temperature (570 K) showing promise in recovering low-grade waste heat using thermomagnetic generation. In contrast, we show that isostructural FeB displays very similar magnetic ordering characteristics, but is not an effective magnetocaloric. Temperature- and field-dependent diffraction studies reveal dramatic magnetoelastic coupling in MnB, which exists without a magnetostructural transition. No such behavior is seen in FeB. Furthermore, the magnetic transition in MnB is shown to be subtly first-order, albeit with distinct behavior from that displayed by other magnetocalorics with first-order transitions. Density functional theory-based electronic structure calculations point to the magnetoelastic behavior in MnB as arising from a competition between Mn moment formation and B–B bonding.

Uncontrolled Keywords: This work was supported by the National Science Foundation (NSF) through DMR-1710638. Partial support by the NSF MRSEC Program under DMR 1720256 (IRG-1) is acknowledged. J.D.B. is supported by the NSF Graduate Research Fellowship Program under 1650114. We also acknowledge the use of the facilities of the Center for Scientific Computing at UC Santa Barbara. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 11 Sep 2020 06:46
Last Modified: 11 Sep 2020 06:46
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