Synthesis and characterization of (Ce-Er)FeO3 nanocomposites for structural, optical, thermal, dielectric, electrical and magnetic applications.

Autor:	Harikrishnan, R., Mani, M., Kumar, M., Ramesh, A., Mani, G., Kaviyarasu, K., Baskaran, I.
Předmět:	CERIUM oxides MAGNETICS DISTRIBUTION (Probability theory) CHEMICAL fingerprinting MOLECULAR force constants RARE earth oxides ERBIUM compounds
Zdroj:	Applied Physics A: Materials Science & Processing; Jan2023, Vol. 129 Issue 1, p1-19, 19p, 1 Black and White Photograph, 1 Diagram, 3 Charts, 9 Graphs
Abstrakt:	A side cation cerium and erbium substituted rare earth orthoferrite composites in the orthorhombic phase have been synthesized by one step microwave-assisted technique with the help of random distribution of heating under the released NO2 and CO2 gaseous environments. Rietveld refinement analysis has confirmed the existence of two products (CeFeO3 and ErFeO3) with the same space group. The calculated lattice parameters from the refined PXRD pattern have shown that the vacancy of the A-side cation is slightly higher than the B-side cation. In CeFeO3 phase, the cation Ce3+ occupies coordinate positions at 0.4939 (x), 0.04293 (y) and 0.25000 (z), while the cation Er3+ occupy positions at − 0.01713 (x), 0.07023 (y) and 0.25000 (z) in ErFeO3 phase in the unit cell box range x = − 1, 1; y = − 1, 1; z = 0, 1. The increased broadening in the PXRD pattern is raised due to the incorporation of Ce and Er ion into the ErFeO3 and CeFeO3 phase, respectively, or the addition of impurity atoms or oxygen vacancy induced defects. The DTA curve confirmed that the releasing of energies due to an exothermic peak at 495 °C initiated the orthorhombic phase formation. The calculated bond length, harmonic force constants, and vibrational frequency of Er–O and Fe–O groups from the FTIR fingerprint region of polyhedral arrangement of metal oxides agree with the calculated values from the Rietveld refined PXRD spectrum. The Barkhausen noise in the M–H curve appears above the point of 2500 Oe, and it continues after the saturation point, which ensures the existence of ferromagnetic domains in the sample and their random domain wall-size formation due to a variation in the applied H field. MT curve analysis with ZFC and FC mode has indicated the compensation point of composites at 205.52 K. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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