Magnetocaloric properties of (Gd1-xErx)(3)Ru alloys and their composites
| Autor: | Monteiro, José Carlos Botelho, 1984, Gandra, Flávio César Guimarães, 1954 |
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| Přispěvatelé: | UNIVERSIDADE ESTADUAL DE CAMPINAS |
| Rok vydání: | 2019 |
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| Zdroj: | Repositório Institucional da Unicamp Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP Repositório da Produção Científica e Intelectual da Unicamp |
| Popis: | Agradecimentos: This work was financially supported by the Brazilian agencies FAPESP, Capes, CNPq and FAEPEX-Unicamp Abstract: We present magnetization, specific heat and magnetocaloric effect results for the compounds (Gd1-xErx)(3)Ru, with x = 0.05, 0.1, 0.2 and 1. As Er concentration increases we observe a significant reduction of the transition temperature from 52 K to 8.1 K and a change from first order ferromagnetic to second order antiferromagnetic behavior. Despite the magnetic arrangement changes, the magnetocaloric potential remains high and a composite formed with these compounds is proposed to achieve temperatures of 20 K starting from nitrogen boiling point. The magnetic entropy variation and adiabatic temperature change of the composite were directly measured presenting a plateau between 20 K and 77 K with values higher than 6 J/kg.K and 3 K respectively for a magnetic field variation of 5 T FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ Fechado |
| Databáze: | OpenAIRE |
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