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- Title
INFRARED REFLECTIVITY ANALYSIS OF Y<sup>3+</sup> SUBSTITUTED LaMnO<sub>3</sub>.
- Authors
AHMAD, J.; ABBAS, H.; BUKHARI, S. H.; JAMIL, M. T.; NISSAR, U.; KHAN, J. A.; ALI, S. A.
- Abstract
Multiferroic manganite La1-xYxMnO3 (LYMO) (x=0.0, 0.2, 0.4, 0.6) have been synthesized by using sol-gel method. The powder X-ray diffraction (XRD) pattern with a Rietveld refinement analysis exhibits a transition from rhombohedral to orthrohombic for 0.4 ≤ x ≤ 0.6. A comprehensive study of infrared (IR) active phonons was carried out at room temperature in the frequency range 30-7500 cm-1 by means of Fourier transform infrared (FTIR) spectrometer. Optical parameters i.e. resonant frequency (ωTO(j)), oscillator strength (Sj) and damping factor (Υj) of observed phonons have been determined by Lorentz oscillators model fit to the measured reflectivity. The frequency shifts of optical phonons have been observed with the increase in x. The change in optical parameters of IR active phonons reflects the confirmation of phase transformation. Moreover, Born and Szigeti effective charges were calculated to understand the polarization effect and ionicity in the present multiferroic system.
- Subjects
X-ray diffraction; NEAR infrared reflectance spectroscopy; RESONANT power convertors; FOURIER transform spectroscopy; FOURIER transform optics
- Publication
Journal of Ovonic Research, 2018, Vol 14, Issue 6, p429
- ISSN
1842-2403
- Publication type
Article