Effect of magnetic coupling on non-radiative relaxation time of Fe3+ sites on LaAl1−xFexO3 pigments

Inorganic pigments of the system LaAl1–xFexO3 were prepared by the Pechini and the Solid State Reaction (SSR) methods. Magnetic interactions and non-radiative relaxation time were analyzed by means of phase-resolved photoacoustic spectroscopy and electron paramagnetic resonance (EPR) techniques. EPR...

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Bibliographic Details
Published in:Journal of applied physics 2018-02, Vol.123 (7)
Main Authors: Novatski, A., Somer, A., Maranha, F. G., de Souza, E. C. F., Andrade, A. V. C., Antunes, S. R. M., Borges, C. P. F., Dias, D. T., Medina, A. N., Astrath, N. G. C.
Format: Article
Language:English
Subjects:
Absorption spectra
Antiferromagnetism
Applied physics
Coupling
Electron paramagnetic resonance
Electron transitions
Magnetic induction
Magnetic properties
Pigments
Relaxation time
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Summary:Inorganic pigments of the system LaAl1–xFexO3 were prepared by the Pechini and the Solid State Reaction (SSR) methods. Magnetic interactions and non-radiative relaxation time were analyzed by means of phase-resolved photoacoustic spectroscopy and electron paramagnetic resonance (EPR) techniques. EPR results show a change in the magnetic behavior from paramagnetic (x = 0.2 and 0.4) to antiferromagnetic (x = 1.0), which is believed to be a result of the SSR preparation method. Trends in the optical absorption bands of the Fe3+ are attributed to their electronic transitions, and the increase in the band's intensity at 480 and 550 nm was assigned to the increase in the magnetic coupling between Fe–Fe. The phase-resolved method is capable of distinguishing between the two preparation methods, and it is possible to infer that SSR modifies the magnetic coupling of Fe–Fe with x.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4998642