Impact of rare earth substitution on structural and optical properties of multiferroic La2−xGdxNiMnO6

Polycrystalline La2−XGdXNiMnO6 (x = 0.0, 0.5 and 1.0) double perovskites were synthesized by auto combustion sol-gel method. The prepared samples have monoclinic phase with space group P21/n, revealed by Rietveld analysis of x-ray diffraction (XRD) pattern. The analysis of reflectivity spectrum show...

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Bibliographic Details
Published in:Materials research express 2019-11, Vol.6 (12)
Main Authors: Ahmad, Javed, Siddique, Muhammad, Khan, Jamshaid Alam, Bukhari, Syed Hammad, Sultan, Tahir
Format: Article
Language:English
Subjects:
band gap
double perovskite
infrared reflectivity
optical phonon
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Summary:Polycrystalline La2−XGdXNiMnO6 (x = 0.0, 0.5 and 1.0) double perovskites were synthesized by auto combustion sol-gel method. The prepared samples have monoclinic phase with space group P21/n, revealed by Rietveld analysis of x-ray diffraction (XRD) pattern. The analysis of reflectivity spectrum showed well resolved infrared (IR) active phonon modes. We discuss the results in terms of different phonon bands originated as a result of atomic vibrations. Optical energy band gap (Eg) has been estimated from optical conductivity ( 1 ( )) spectrum and UV-visible absorption spectrum. Temperature dependent resistivity measurements suggest variable range hopping conduction mechanism in these multiferroics.
ISSN:2053-1591
DOI:10.1088/2053-1591/ab5870