Tailoring Negative Thermal Expansion via Tunable Induced Strain in La-Fe-Si-Based Multifunctional Material

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Fleming, RO (Autor) Outra; Goncalves, S (Autor) Outra; Davarpanah, A (Autor) Outra; Radulov, I (Autor) Outra; Pfeuffer, L (Autor) Outra; Beckmann, B (Autor) Outra; Skokov, K (Autor) Outra; Ren, Y (Autor) Outra; Li, TY (Autor) Outra; Evans, J (Autor) Outra; Amaral, J (Autor) Outra; Almeida, R (Autor) Outra; Lopes, A (Autor) FCUP; Oliveira, G (Autor) FCUP; araujo, j. p. (Autor) FCUP; Apolinário, A. (Autor) FCUP; Belo, JH (Autor) FCUP

Revista

Título: ACS Applied Materials & Interfaces

Vol. 14

ISSN: 1944-8244

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00X-95G

DOI: 10.1021/acsami.2c11586

Abstract (EN): Zero thermal expansion (ZTE) composites are typically designed by combining positive thermal expansion (PTE) with negative thermal expansion (NTE) materials acting as compensators and have many diverse applications, including in high-precision instrumentation and biomedical devices. La(Fe1-x,Si-x)13-based compounds display several remarkable properties, such as giant magnetocaloric effect and very large NTE at room temperature. Both are linked via strong magnetovolume coupling, which leads to sharp magnetic and volume changes occurring simultaneously across first-order phase transitions; the abrupt nature of these changes makes them unsuitable as thermal expansion compensators. To make these materials more useful practically, the mechanisms controlling the temperature over which this transition occurs and the magnitude of contraction need to be controlled. In this work, ball-milling was used to decrease particles and crystallite sizes and increase the strain in LaFe11.4Mn0.27Si1.29Hx alloys. Such size and strain tuning effectively broadened the temperature over which this transition occurs. The material's NTE operational temperature window was expanded, and its peak was suppressed by up to 85%. This work demonstrates that induced strain is the key mechanism controlling these materials' phase transitions. This allows the optimization of their thermal expansion toward room-temperature ZTE applications.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10