MnBi is a magnetic material with many peculiar properties, interesting for different applications such as rare-earth-free permanent magnets and magnetic refrigeration. In this work the entropy change and the transformation kinetics of the magneto-structural transition are investigated, for two sets of samples with different grain size (“as-annealed” and “compacted pwd”). Both sets show a logarithm dependence on the temperature scan rate of the transition temperature upon cooling. This suggests that thermal activation effects are present. The estimated activation volume v0 of the magneto-structural transition corresponds to around 120 atoms.

Magnetocaloric Properties of MnBi Compound as a Function of Grain Size / Curcio, Carmen; Olivetti, Elena S.; Martino, Luca; Kuepferling, Michaela; Basso, Vittorio. - 257:(2016), pp. 143-146. (Intervento presentato al convegno International Conference on Solid Compounds of Transition Elements tenutosi a Zaragoza nel 11-15 Aprile 2016) [10.4028/www.scientific.net/SSP.257.143].

Magnetocaloric Properties of MnBi Compound as a Function of Grain Size

Olivetti, Elena S.;Martino, Luca;Kuepferling, Michaela;Basso, Vittorio
2016

Abstract

MnBi is a magnetic material with many peculiar properties, interesting for different applications such as rare-earth-free permanent magnets and magnetic refrigeration. In this work the entropy change and the transformation kinetics of the magneto-structural transition are investigated, for two sets of samples with different grain size (“as-annealed” and “compacted pwd”). Both sets show a logarithm dependence on the temperature scan rate of the transition temperature upon cooling. This suggests that thermal activation effects are present. The estimated activation volume v0 of the magneto-structural transition corresponds to around 120 atoms.
2016
International Conference on Solid Compounds of Transition Elements
11-15 Aprile 2016
Zaragoza
restricted
File in questo prodotto:
File Dimensione Formato  
118-Curcio_scte.pdf

solo utenti autorizzati

Tipologia: final published article (publisher’s version)
Licenza: Non Pubblico - Accesso privato/ristretto
Dimensione 641.05 kB
Formato Adobe PDF
641.05 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/54617
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? ND
social impact