The giant magnetocaloric effect in Gd5Si2Ge2 with low purity gadolinium

The giant magnetocaloric effect in Gd5Si2Ge2 with low purity gadolinium

The giant magnetocaloric effect Gd5Si2Ge2 alloy was prepared with 99wt% low purity commercial Gd. Powder XRD and magnetic measurements showed that the Gd5Si2Ge2 alloy annealed at 1200℃ for 1h had a significant magnetic- crystallographic first order phase transition at about 270 K. The maximal magnet...

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Veröffentlicht in:Chinese science bulletin 2005-01, Vol.50 (16), p.1811-1814
1. Verfasser: ZHANG, Tiebang
Format: Artikel
Sprache:eng
Schlagworte:
Entropy
Gadolinium
Gadolinium silicide
Gd5Si2Ge2
Heat treatment
High temperature
Magnetic fields
Magnetic measurement
Phase transitions
Purity
熵变换
钆合金
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Zusammenfassung:The giant magnetocaloric effect Gd5Si2Ge2 alloy was prepared with 99wt% low purity commercial Gd. Powder XRD and magnetic measurements showed that the Gd5Si2Ge2 alloy annealed at 1200℃ for 1h had a significant magnetic- crystallographic first order phase transition at about 270 K. The maximal magnetic entropy change is 17.55 J· kg^-1· K^-1 under a magnetic field change of 0-5 T. The distinct increase of magnetic entropy change belongs to the first-order phase transition from the orthorhombic Gd5Si4-type to the monoclinic Gd5Si2Ge2-type after high temperature heat-treatment.
ISSN:1001-6538
2095-9273
1861-9541
2095-9281
DOI:10.1360/982005-349