Nanocrystalline GdAlO3: XPS,EPR and magnetic susceptibility studies |
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Authors: | Petrov Dimitar |
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Institution: | (1) Department of Inorganic and Physical Chemistry, University of Food Technologies, 26, Maritsa Blvd., 4002 Plovdiv, Bulgaria;(2) Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee, 1784 Sofia, Bulgaria |
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Abstract: | Nanocrystalline gadolinium monoaluminate (GdAlO3) has been synthesized by sol–gel method after sintering the precursor gel at 950°C. The microstructural features have been
proved by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive
X-ray analysis (EDX). The XRD pattern confirms the formation of single-phase GdAlO3 while EDX shows that this nanomaterial is stoichiometric; the average size of the nanoparticles is 40 nm. X-ray photoelectron
spectroscopy (XPS) has been used to study the chemical composition and bonding in the as-prepared samples. The binding energies
of core-level electrons in Gd, Al and O in GdAlO3 nanopowder have been found slightly shifted compared to the corresponding values of the same elements. The electron paramagnetic
resonance (EPR) spectra at 9.23 GHz (X-band) and different temperatures indicate the existence of magnetically concentrated
solid containing Gd3+ ions. Nèel temperature, T
N
=3.993 K, effective Bohr magneton number, μ
eff=8.18, and constant of magnetic exchange interaction, J
ex=−0.069 cm−1, have been determined from DC magnetic susceptibilities measured in the range 2–300 K. |
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Keywords: | |
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