Structural, magnetic and magnetic fluid hyperthermia application of La0.7Ca0.1K0.2MnO3

Abstract

La0.7Ca0.1K0.2MnO3 nanoparticles were synthesized by sol-gel method. The structural, magnetic and magneto-thermal properties of the compound were investigated in detail. Structural property was performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In the XRD pattern, Rietveld analysis was used by the FullProf program. At the end of the analysis, it was observed that the crystal lattice of the compound has an orthorhombic structure and that La2O3, Mn3O4 and MnO2 impurities were found. SEM analysis showed that the nanoparticles have a near- spherical geometry and the impurities have a hexagonal and cube-shaped in some regions. As a result of the magnetic analysis, it was observed that the compound occurred the ferromagnetic-partly paramagnetic phase transition at room temperature. The saturation magnetization of the ferromagnetic part was 1.9 Am2 /kg and the coercivity of the compound was determined to be 12 mT. The specific absorption rate (SAR) value of the compound from the magneto- thermal measurements was calculated to be 11.5 W/g.

Keywords

• Perovskite manganite,Magnetic fluid hyperthermia,Sol-Gel,SEM

La0.7Ca0.1K0.2MnO3 BİLEŞİĞİNİN MANYETİK AKIŞKAN HİPERTERMİ UYGULAMASI

Abstract

La0.7Ca0.1K0.2MnO3 nanoparçacıklar sol-gel yöntemiyle sentezlendi. Bileşiğin yapısal, manyetik ve manyeto-termal özellikleri detaylı bir biçimde incelendi. Yapısal özellikleri X-ışını kırınımı (XRD) ve taramalı elektron mikroskobu (SEM) ile gerçekleştirildi. XRD deseninde FullProf programı yardımıyla Rietveld analizi gerçekleştirildi. Analiz sonucunda bileşiğin kristal örgüsünün ortorombik yapıya sahip olduğu ve içerisinde La2O3, Mn3O4 ve MnO2 safsızlıklarının bulunduğu gözlendi. SEM analiziyle nanoparçacıkların küresele yakın bir geometriye sahip olduğu ve safsızlıkların altıgen ve küp şeklinde belirli bölgelerde oluştuğu görüldü. Manyetik analizlerin sonucunda bileşiğin oda sıcaklığında ferromanyetik kısmen paramanyetik duruma geçtiği görüldü. Ferromanyetik faza ait doyum mıknatıslanması 1,9 Am2 /kg ve bileşiğin koarsivite değeri 12 mT olduğu belirlendi. Manyeto-termal ölçümler sonucunda bileşiğin spesifik soğurma oranı (SAR) değeri 11,5 W/g olarak hesaplandı.

Keywords

• Perovskit manganit,manyetik akışkan hipertermi,Sol-Gel,SEM

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