Indium segregation in Gd5(Si, Ge)4 magnetocaloric materials

Belo, João H.; Mudryk, Y.; Paudyal, D.; Pecharsky, V. K.; Oliveira, G. N. P.; Lopes, A. M. L.; Morellon, L.; Algarabel, P. A.; Magen, C.; Ibarra, M. R.; Marcano, N.; Araújo, João P.; Pereira, André M.

doi:10.1016/j.jallcom.2021.162245

Title: Indium segregation in Gd₅(Si, Ge)₄ magnetocaloric materials

Journal Article · Sat Oct 09 00:00:00 EDT 2021 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2021.162245· OSTI ID:1827095

Belo, João H. ^[1]; Mudryk, Y. ^[2]; Paudyal, D. ^[2]; Pecharsky, V. K. ^[2]; Oliveira, G. N. P. ^[1]; Lopes, A. M. L. ^[1]; Morellon, L. ^[3]; Algarabel, P. A. ^[3]; Magen, C. ^[3]; Ibarra, M. R. ^[3]; Marcano, N. ^[3]; Araújo, João P. ^[1]; Pereira, André M. ^[1]

Universidade do Porto (Portugal)
Ames Lab., and Iowa State Univ., Ames, IA (United States)
Universidad de Zaragoza (Spain)

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 Gd₅Si_1.2Ge_2.8 stoichiometry were prepared. Here, 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Foundation for Science and Technology (FCT); Ministry of Science, Innovation and Universities (MICIU)

Grant/Contract Number:: AC02-07CH11358; POCI/CTM/61284/2004; PTDC/CTM-NAN/115125/2009; FEDER/POCTI n0155/94; SFRH/BPD/63150/2009; SFRH/BD/88440/2012; PTDC/FISMAC/ 31302/2017; SFRH-BPD-87430/2012; POCI-01-0145-FEDER-032527; POCI-01-0145-FEDER-029454; CERN-FIS-PAR-0005-2017; MAT2017-82970-C2; E28-20R

OSTI ID:: 1827095

Report Number(s):: IS-J-10,613

Journal Information:: Journal of Alloys and Compounds, Vol. 893; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Indium segregation in Gd5(Si, Ge)4 magnetocaloric materials

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Title: Indium segregation in Gd₅(Si, Ge)₄ magnetocaloric materials