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
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Bocarsly, Joshua D. ; Levin, Emily E. ; Humphrey, Samuel A. ; Faske, Tom ; Donner, Wolfgang ; Wilson, Stephen D. ; Seshadri, Ram |
| Art des Eintrags: | Bibliographie |
| Titel: | Magnetostructural Coupling Drives Magnetocaloric Behavior: The Case of MnB versus FeB |
| Sprache: | Englisch |
| Publikationsjahr: | 20 Juni 2019 |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Chemistry of Materials |
| Jahrgang/Volume einer Zeitschrift: | 31 |
| (Heft-)Nummer: | 13 |
| DOI: | 10.1021/acs.chemmater.9b01476 |
| URL / URN: | https://pubs.acs.org/doi/10.1021/acs.chemmater.9b01476 |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | 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. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 11 Sep 2020 06:46 |
| Letzte Änderung: | 11 Sep 2020 06:46 |
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