Indium segregation in Gd-5(Si, Ge)(4) magnetocaloric materials

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Belo, JH (Author) FCUP; Mudryk, Y (Author) Other; pereira, a. m. (Author) FCUP; Oliveira, GNP (Author) FCUP; Lopes, AML (Author) FCUP; Paudyal, D (Author) Other; Morellon, L (Author) Other; Algarabel, PA (Author) Other; Magen, C (Author) Other; Marcano, N (Author) Other; Pecharsky, VK (Author) Other; araujo, j. p. (Author) FCUP

Journal

Title: Journal of Alloys and Compounds

Vol. 893

ISSN: 0925-8388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00V-M36

DOI: 10.1016/j.jallcom.2021.162245

Abstract (EN): Chemical substitution is one of the most efficient tools to tune and optimize magnetic and magnetocaloric properties of the giant magnetocaloric materials. In particular, Indium substitutions could be useful both for tuning properties of these interesting intermetallic materials and to unveil their local-scale behavior across the magnetostructural transition via hyperfine techniques. Hence, in order to investigate the effect of Indium additions on the crystal structure, micro-structure, magnetic and magnetocaloric properties, a series of In-containing samples derived from the base Gd5Si1.2Ge2.8 stoichiometry were prepared. The major findings are that while In is insoluble in the 5: 4 phase, it will instead promote the emergence of the impurity 5: 3 phase and segregates into this phase. Hence, In leads to major crystallographic changes, which enhance atomic disorder and disrupt the Si to Ge ratio in the 5: 4 phase. Subsequently, a higher 5: 4 unit cell volume and a lower magnetic ordering temperature are found in the In-substituted samples. Finally, the magnetocaloric properties of the In-substituted samples reveal a detrimental effect on the maximum magnetic entropy change.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10