Structural, electrical and magnetic studies on Y-Fe-O system
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：Sathiyakumar Saravanan Anbarasu Venugopalan Manigandan Appasamy Jayabalan Kothandaraman Kaliyaperumal Kothandaraman
Key words：magnetoelectric materials; characterization methods; powder technology; diffused reflectance spectroscopy; vibrating sample magnetometer; electron paramagnetic resonance; rare earths;
Abstract: The compounds of iron substituted yttrium oxide systems have been prepared for the importance in the field of magneto electric materials. The polycrystalline samples of Y_(2-x)Fe_xO_(3-y)(x=0.1, 0.2) were prepared by solid-state reaction method. The single-phase formation of these compounds was confirmed by X-ray diffraction studies. It was found that the samples crystallized in tetragonal phase and the lattice parameters were calculated as a=1.0559(7) nm, c=-1.0832(9) nm for Y_(1.9)Fe_(0.1)O_(3-y) and a=1.0545(6) nm, c=1.0841(8) nm for Y_(1.8)Fe_(0.2)O_(3-y). The lattice constant changed with the variation of Fe concentration, which indicated the incorporation of Fe~(3+) into the hosting Y_2O_3. The semi-conducting nature of the prepared compounds was observed with the energy gap calculation from diffused reflectance spectroscopy (DRS) studies. The ferromagnetic nature of the prepared compounds was identified with vibrating sample magnetometer studies. This information were corroborated by the observation of the well broadened EPR lines in the electron paramagnetic resonance (EPR) spectra of the samples with a low Fe concentration, which manifested the onset of Fe-Fe exchange interaction in the prepared samples.
Sathiyakumar Saravanan1，Anbarasu Venugopalan1，Manigandan Appasamy1，Jayabalan Kothandaraman1，Kaliyaperumal Kothandaraman2
(1.Department of Physics,Anna University,Chennai-600025,India;
2.Department of Physics,Pondicherry Engineering College,Pondicherry-605014,India)
Abstract:The compounds of iron substituted yttrium oxide systems have been prepared for the importance in the field of magneto electric materials. The polycrystalline samples of Y_(2-x)Fe_xO_(3-y)(x=0.1, 0.2) were prepared by solid-state reaction method. The single-phase formation of these compounds was confirmed by X-ray diffraction studies. It was found that the samples crystallized in tetragonal phase and the lattice parameters were calculated as a=1.0559(7) nm, c=-1.0832(9) nm for Y_(1.9)Fe_(0.1)O_(3-y) and a=1.0545(6) nm, c=1.0841(8) nm for Y_(1.8)Fe_(0.2)O_(3-y). The lattice constant changed with the variation of Fe concentration, which indicated the incorporation of Fe~(3+) into the hosting Y_2O_3. The semi-conducting nature of the prepared compounds was observed with the energy gap calculation from diffused reflectance spectroscopy (DRS) studies. The ferromagnetic nature of the prepared compounds was identified with vibrating sample magnetometer studies. This information were corroborated by the observation of the well broadened EPR lines in the electron paramagnetic resonance (EPR) spectra of the samples with a low Fe concentration, which manifested the onset of Fe-Fe exchange interaction in the prepared samples.
Key words:magnetoelectric materials; characterization methods; powder technology; diffused reflectance spectroscopy; vibrating sample magnetometer; electron paramagnetic resonance; rare earths;
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