Lanthanum Dilution Effects on the Giant Magnetocaloric Gd5Si1.8Ge2.2 Compound

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Andrade, VM (Autor) Outra; Belo, JH (Autor) Outra; Reis, MS (Autor) Outra; Costa, RM (Autor) Outra; pereira, a. m. (Autor) FCUP; araujo, j. p. (Autor) FCUP

Revista

Título: Physica Status Solidi (B): Basic Research

Vol. 255

ISSN: 0370-1972

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

Outras Informações

ID Authenticus: P-00P-M6Q

DOI: 10.1002/pssb.201800101

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6