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

Autor: Vitalij K. Pecharsky, G.N.P. Oliveira, César Magén, J. P. Araújo, A.M.L. Lopes, J. H. Belo, Yaroslav Mudryk, Alberto M. Pereira, N. Marcano, Pedro A. Algarabel, Durga Paudyal, M. R. Ibarra, Luis Morellón
Přispěvatelé: Fundação para a Ciência e a Tecnologia (Portugal), European Commission, Centre National de la Recherche Scientifique (France), Diputación General de Aragón, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Department of Energy (US), Iowa State University
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: 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.
Work is partially supported by the projects POCI/CTM/61284/2004, PTDC/CTM-NAN/115125/2009, FEDER/POCTI n0155/94 from Fundacão para a Ciência ex Tecnologia (FCT), Portugal. A.M.P. thanks FCT for the Grant No. SFRH/BPD/63150/2009. J H Belo thanks FCT for the Grant SFRH/BD/88440/2012, the project PTDC/FISMAC/ 31302/2017 and his contract DL57/2016 reference SFRH-BPD-87430/2012. Work at IFIMUP is supported by the following funding projects: POCI-01-0145-FEDER-032527, POCI-01–0145-FEDER-029454 and CERN-FIS-PAR-0005-2017. Work at the INMA is supported by the Spanish Ministerio de Ciencia, Innovacion y Universidades through project MAT2017-82970-C2, PID2020-112914RB-I00 and Spanish DGA (grant no. E28−20R). The research at Ames Laboratory is supported by the Materials Sciences and Engineering Division, Office of Basic Energy Sciences of the U.S. Department of Energy (DOE). Ames Laboratory is operated for the U.S DOE by Iowa State University under Contract No. DE-AC02-07CH11358.
Databáze: OpenAIRE
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