Lanthanum Dilution Effects on the Giant Magnetocaloric Gd5Si1.8Ge2.2 Compound
authors Andrade, VM; Belo, JH; Reis, MS; Costa, RM; Pereira, AM; Araujo, JP
nationality International
journal PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
author keywords chemical substitution; magnetic phase transition; magnetocaloric compounds
keywords STRUCTURE DEPENDENCE; MAGNETIC-PROPERTIES; CRYSTAL; TRANSITION; ALLOYS
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 x2. A monotonic expansion of the unit cell volume with a rate of 28 angstrom(3)/La by increasing the content of the non-magnetic La ions in the system influences significantly the overall magnetic behavior. For instance, T-C decreases in a rate of dT(C)/dx=-47.8KLa(-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.
publisher WILEY-V C H VERLAG GMBH
issn 0370-1972
year published 2018
volume 255
issue 10
digital object identifier (doi) 10.1002/pssb.201800101
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000447304700010
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