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

Year 2019, , 153 - 162, 31.12.2019

Atakan Tekgül

https://doi.org/10.17482/uumfd.417524

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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