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Lanthanum Dilution Effects on the Giant Magnetocaloric Gd5Si1.8Ge2.2 Compound.
- Source :
-
Physica Status Solidi (B) . Oct2018, Vol. 255 Issue 10, pN.PAG-N.PAG. 1p. - Publication Year :
- 2018
-
Abstract
- A study on the fundamental properties of Gd5−xLaxSi1.8Ge2.2 pseudo‐binary compounds with x = 1, 2, 3, 4, and 5 is performed by means of X‐ray powder diffraction (XRD) and magnetic measurements. An evolution from a monoclinic (M) Gd5Si2Ge2‐type to a tetragonal (T) Zr5Si4‐type structure, with the addition of La, is observed, finding that the T phase is stable for x ≥ 2. A monotonic expansion of the unit cell volume with a rate of 28 Å3/La by increasing the content of the non‐magnetic La ions in the system influences significantly the overall magnetic behavior. For instance, TC decreases in a rate of dTC/dx = −47.8 K La−1; and a considerable hysteresis reduction is observed as a result of the change on the nature of the phase transition from a first to a second‐order one. Hence, these results reveal the impact of a non‐magnetic La substitution on both magnetic and crystallographic properties of this series. A study on the crystallographic, magnetic, and magnetocaloric properties of (Gd,La)5(Si,Ge)4 pseudo‐binary compounds is presented here. The change from a monoclinic to a tetragonal structure for La content higher than 20% is observed. There is a monotonic decrease in TC with a considerable hysteresis reduction and a change on the nature of the phase transition from a first to a second‐order one. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03701972
- Volume :
- 255
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Physica Status Solidi (B)
- Publication Type :
- Academic Journal
- Accession number :
- 132394517
- Full Text :
- https://doi.org/10.1002/pssb.201800101