Effect of the stoichiometry in La0.7(SrxCa0.3-x)MnO3 by x-ray photoelectron spectroscopy for hyperthermia applications
Fecha
2020-07-28Autor
Mani Gonzalez, Pierre Giovanni
Farias, Rurik
Elizalde Galindo, Jose Trinidad
CARRILLO FLORES, DIANA MARÍA
Rivera-Rios, L
Martínez-Guerra, E; Snelgrove, M; Hernandez-Marquez, JA; Cortez-Valadez, M
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The use of physical properties in magnetic materials is a research area aiming to help overcome
the biomaterial problems encountered in hyperthermia cancer treatment. A1-xBxMnO3
nanoparticle structures are one such magnetic material which offers functionality in
hyperthermia applications. Co-precipitation was employed as a method of nanoparticle
synthesis. This process is a low energy method of obtaining nanoparticles, when compared with
the traditional ceramic method. The structure and stoichiometry of lanthanum manganite
nanoparticles doped with strontium and calcium (LMSCNPs) were obtained by scanning
electron microscopy and x-ray photoelectron spectroscopy respectievtly. Mn and La ratios were
kept constant during the synthesis. Stoichiometric ratios were varied from x = 0.0 to x = 0.2 for
strontium concentration in La0.7Ca0.3-xSrxMnO3. Ca 2p and Sr 3s spectra suggests strontium
incorporation increases when the calcium signal decreases. The strontium atoms have a direct
effect on the magnetic properties for reordering magnetic domains according to vibrating
sample magnetometer results reported previously. The composition between Sr and Ca atoms
needs to be around x = 0.15 (rhombohedral) for the effective Curie temperature (Tc) control of
LMSCNPs. Tc decreases when the strontium atoms increases, with the results showing that
LMSCNPs with a rhombohedral structure have the potential to contribute to hyperthermia
treatment.