Magnetic and magnetocaloric properties of the coloured Heusler phases GdAg2Mg and REAgAuMg (RE=Gd, Tb, Dy)
-
Lukas Heletta
Abstract
The magnetocaloric effect (MCE) of the ferromagnetic compound GdAg2Mg [TC=98.3(5) K] was investigated along with its electrical resistivity and the specific heat capacity. The magnetic entropy changes (–ΔSM) as well as the changes in adiabatic temperature (ΔTad) have been calculated from these data. Furthermore, the magnetic susceptibility of the pseudo-quaternary Heusler phases GdAgAuMg, TbAgAuMg and DyAgAuMg [i.e. RE(Ag0.5Au0.5)2Mg] were measured and compared to the data for the pure silver and gold compounds REAg2Mg and REAu2Mg. The substitution of the transition metal at the crystallographic Wyckoff site 8c influences the magnetic ground state of the trivalent rare earth metals and therefore drastically alters the Curie temperatures. The structure of GdAgAuMg was refined from single crystal X-ray diffraction data, revealing a small deviation from the equiatomic composition leading to the refined formula GdAg0.92(6)Au1.08(6)Mg [space group Fm3̅m, Z=4, a=695.03(10) pm, wR2=0.0883, 55 F2 values, six parameters]. The intermetallic compounds were synthesised in sealed niobium ampoules under high temperature conditions. They have reddish to brassy colour.
Acknowledgements
We thank Dipl.-Ing. Jutta Kösters for the single-crystal intensity measurement.
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Articles in the same Issue
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- Orthoamide und Iminiumsalze, XCVa. Umsetzungen von Orthoamiden von Alkin-Carbonsäuren mit Acetophenonen und Acetophenon-Phenylhydrazonen
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- Preparation and molecular structures of N′-(2-heteroarylmethylidene)-3-(3-pyridyl)acrylohydrazides
- A new modification of [Ag4Br4(PPh3)4]: synthesis, structure and properties
- Magnetic and magnetocaloric properties of the coloured Heusler phases GdAg2Mg and REAgAuMg (RE=Gd, Tb, Dy)
Articles in the same Issue
- Frontmatter
- In this Issue
- Analysis of two [2]catenanes based on electron densities from invariom refinement and results from DFT calculations
- Orthoamide und Iminiumsalze, XCVa. Umsetzungen von Orthoamiden von Alkin-Carbonsäuren mit Acetophenonen und Acetophenon-Phenylhydrazonen
- Metal-free, air-promoted, radical-mediated arylation of benzoquinone with phenylhydrazines
- Three-component condensation reaction of various aldehydes, dimedone and malononitrile catalyzed by boric acid in water in comparison with multifunctional ionic liquids as green catalytic systems
- Synthesis, characterization, and electrochemical study of a mononuclear Cu(II) complex with a 4-acyl pyrazolone ligand
- Synthesis of LaCoO3 powder by a combined mechanical/thermal process
- Preparation and molecular structures of N′-(2-heteroarylmethylidene)-3-(3-pyridyl)acrylohydrazides
- A new modification of [Ag4Br4(PPh3)4]: synthesis, structure and properties
- Magnetic and magnetocaloric properties of the coloured Heusler phases GdAg2Mg and REAgAuMg (RE=Gd, Tb, Dy)
