The Sintering Temperature Effect on Magnetocaloric Effect in La2MnNiO6 Double Perovskite Manganite Material

Year 2023, Volume: 13 Issue: 1&2, 28 - 42, 31.12.2023

İbrahim Barış Sever , Arda Kandemir , Ali Osman Ayaş , Ahmet Ekicibil

https://doi.org/10.37094/adyujsci.1329921

Abstract

La2NiMnO6 double-perovskite manganite samples were produced with sol-gel method to investigate structural, morphological, magnetic and magnetocaloric properties. They were sintered at 1000 and 1100 ̊C for LNM-1000 and LNM-1100 sample, respectively. The crystal structure of the samples was determined as Rhombohedral with R3𝑐 space group. Morphological analyses revealed that LNM-1000 sample included different polygonal shaped grains with small magnitudes, while grain boundaries became unclear for the LNM-1100 sample. The Curie temperatures were determined as 200 and 220 K while effective magnetic moment values were calculated as 1.75 and 2.13 for LNM-1000 and LNM-1100 samples, respectively. Arrot plots showed that samples exhibited second order magnetic phase transition. Maximum magnetic entropy change and relative cooling power values were calculated as 0.21, 0.25 J kg-1 K-1 and 46.2, 50.5 J kg-1 for LNM-1000 and LNM-1100 samples, respectively. Although the samples have the Curie temperature around sub-room temperature range that is much higher than Gd2NiMnO6 (5 K) and they have second order magnetic phase transition, relatively low value of magnetic entropy change values of these samples limits their usage as a magnetic coolant material.

Keywords

Magnetic refrigeration, Magnetocaloric effect, Curie temperature, Double perovskite manganites

Supporting Institution

Adıyaman Üniversitesi Bilimsel Araştırmalar Koordinasyon Birimi

Project Number

FEFYL/2021-0004.

Thanks

This work is supported by the Research Project Unit of the Adıyaman University Under Grant Contract no FEFYL/2021-0004.

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