Freestanding and flexible composites of magnetocaloric Gd5(Si,Ge)4 microparticles embedded in thermoplastic poly(methyl methacrylate) matrix
| Autor: | João P. Araújo, Vivian M. Andrade, J. H. Belo, Ana L. Pires, Nathalie B. Barroca, André Pereira, Kleber R. Pirota |
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| Rok vydání: | 2020 |
| Předmět: |
Thermoplastic
Materials science Hydrostatic pressure Composite number Intermetallic 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound lcsh:TA401-492 General Materials Science Methyl methacrylate Composite material chemistry.chemical_classification Mechanical Engineering Polymer 021001 nanoscience & nanotechnology Poly(methyl methacrylate) Casting 0104 chemical sciences chemistry Mechanics of Materials visual_art visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 186, Iss, Pp-(2020) |
| ISSN: | 0264-1275 |
| Popis: | The implementation of processed magnetic materials onto thermoplastics can be an approach for practical use of brittle intermetallic materials on device development with the advantage of enlarging the range of applications. In this paper, we present the evaluation on the effect of blending magnetocaloric Gd5Si2.4Ge1.6 3.4 μm particles with in different weight fractions onto a flexible, transparent and non-magnetic poly(methyl methacrylate) (PMMA). A close to homogeneous grain distribution along the polymer surface were achieved by using a simple solvent casting method for their magnetocaloric properties studies. From XRD analysis, it was found a unit cell volume shrinkage by increasing the powder concentration followed by a reduction on the amount of secondary monoclinic phase as a result of interfacial interactions. As a consequence, a weakening of secondary phases effect on the composite magnetocaloric behavior is observed as a result of the effective hydrostatic pressure from the difference between thermal expansions of matrix and filler. Keywords: Magnetocaloric effect, Magnetic composite, Flexible composite, Blended microparticles |
| Databáze: | OpenAIRE |
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