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Effects of Ga Substitution in LaFe1-xGaxO3 (x = 0, 0.1, 0.3, 0.5, and 0.7)
Journal of Magnetics, Volume 7, Number 2, 30 Jun 2002, Pages 40-44
Abstract
Crystallographic and magnetic properties of LaFe1-xGaxO3 (x = 0, 0.1, 0.3, 0.5, and 0.7) were studied using XRD and Mössbauer spectroscopy. The crystal structures were found to be orthorhombic and the lattice parameters a, b, and c were found to decrease with increasing Ga substitution. Mössbauer spectra were obtained at various absorber temperatures ranging from 20 K to 750 K. The Mössbauer spectra were all sextets below TN and were all singlets above TN. Asymmetric broadening of the Mssbauer spectral lines at 20 K was explained by the multitude of possible environments for an iron nucleus. As the temperature increases to TN, a systematic line broadening in Mssbauer spectra was observed and interpreted to originate from different temperature dependencies of the magnetic hyperfine fields at various iron sites.
Keywords: Mössbauer; orthoferrite; magnetic dilution; LaFe_1-xGa_xO_3
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