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

Authors : Ibrahim Barış Sever, Arda Kandemir, Ali Osman Ayaş, Ahmet Ekicibil

Pages : 28-42

Doi:10.37094/adyujsci.1329921

View : 65 | Download : 66

Publication Date : 2023-12-31

Article Type : Research Paper

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 R3???? 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 : Manyetik soğutma, Manyetokalorik etki, Curie sıcaklığı, Çift katmanlı perovskitler