Polymer Fe-Rh / PVDF multicaloric composite

A.A. Amirov, D.M. Yusupov, K.V. Sobolev show affiliations and emails
Received 11 April 2021; Accepted 06 May 2021;
This paper is written in Russian
Citation: A.A. Amirov, D.M. Yusupov, K.V. Sobolev. Polymer Fe-Rh / PVDF multicaloric composite. Lett. Mater., 2021, 11(2) 213-217
BibTex   https://doi.org/10.22226/2410-3535-2021-2-213-217


Schematic representation of Fe-Rh/PVDF polymer composite fabrication.A technological protocol has been developed and a polymer magnetoelectric Fe-Rh / PVDF composite consisting of magnetocaloric particles of Fe50Rh50 embedded in a polymer piezoelectric matrix of polyvinyldenfluoride has been manufactured by solvent casting method. The particles of Fe50Rh50 used for the composite fabrication were obtained from an ingot of the same composition by mechanical filing. The average size of the Fe50Rh50 particles fabricated by the mechanical treatment was about 50 μm. X-ray diffraction analysis demonstrates the presence of an electroactive β-phase of polyvinyldenfluoride and an ordered B2 phase corresponding to a crystal structure with a base-centered crystal lattice of Fe50Rh50, which can exhibit magnetoelectric and multicaloric effects. It was shown that the temperature of the transition from the antiferromagnetic to the ferromagnetic state for Fe50Rh50 microparticles is shifted towards higher temperatures of about 500 К as a result of the mechanical action in the process of obtaining Fe-Rh particles, and in the region of about 670 K, a transition from the ferromagnetic state to the paramagnetic one was observed. It has been demonstrated that annealing of the Fe50Rh50 particles at a temperature of 1000°C for 20 minutes is able to recover the magnetic properties close to the bulk sample with a same composition. It should be noted that the annealing in this protocol does not completely eliminate the content of the disordered phase corresponding to the crystal structure with a face-centered cubic lattice, to the ordered structure with base-centered lattice that is seen from the data of magnetic and X-ray diffraction measurements. For the Fe-Rh / PVDF composite, a wide magnetic phase transition of at about 387 K (AFM-FM) in the heating mode and at approximately 364 K (FM-AFM) in the cooling mode was observed, which coincides with the results of magnetic measurements obtained for the heat-treated Fe50Rh50 particles. The proposed method can be used for the design of new composite magnetoelectric composites with caloric effects.

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