The Investigation of Structural, Magnetic and Magnetocaloric Properties of (La0.9Er0.1)0.85K0.15MnO3 Manganite Compound

Year 2019, Volume: 34 Issue: 1, 139 - 144, 31.03.2019

Gönül Akça , Selda Kılıç Çetin

https://doi.org/10.21605/cukurovaummfd.601345

Abstract

In this study, the structural, magnetic and magnetocaloric properties of the polycrystalline (La0.9Er0.1)0.85K0.15MnO3 manganite compound synthesized by sol-gel method have been studied. X-ray diffraction measurement at room temperature shows that the sample crystallizes in rhombohedral structure.  The temperature dependence of magnetization measurement reveals that the sample undergoes ferromagnetic-paramagnetic phase transition with increasing temperature. Maximum magnetic entropy change (∆SMmax) of the sample has been calculated as 2.30 Jkg-1K-1 for magnetic field change of 5 T from isothermal magnetization curves.

Keywords

Manganite, Magnetocaloric effect, Magnetic refrigeration, Curie temperature

(La0.9Er0.1)0.85K0.15MnO3 Manganit Bileşiğinin Yapısal, Manyetik ve Manyetokalorik Özelliklerinin Araştırılması

Abstract

Bu çalışmada, sol-jel yöntemi ile sentezlenen polikristal (La0.9Er0.1)0.85K0.15MnO3 manganit bileşiğinin yapısal, manyetik ve manyetokalorik özellikleri çalışılmıştır. Oda sıcaklığında x-ışını kırınımı ölçümü, numunenin rhombohedral yapıda kristalleştiğini göstermektedir. Sıcaklığa bağlı manyetizasyon ölçümleri, artan sıcaklıkla numunenin ferromanyetik-paramanyetik faz geçişi sergilediğini göstermektedir. Numunenin maksimum manyetik entropi değişimi (∆SMmak.) izotermal mıknatıslanma eğrilerinden 5 T manyetik alan değişimi için 2.30 Jkg-1K-1 olarak hesaplanmıştır.

Keywords

Manganit, Manyetokalorik etki, Manyetik soğutma, Curie sıcaklığı

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