Effect of Sm3+ and Sr2+ dopants on the FT-IR, photoluminescence and surface texture of lanthanum chromite nanoparticles

El‐Sheikh, Said M.; Rashad, M.M.

doi:10.1016/j.jallcom.2010.03.061

Cited by 24 publications

(1 citation statement)

References 30 publications

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“…These are also designated as F 1u (Γ) modes of perovskite structures [34,37]. The substitution of Sr 2+ for Gd 3+ leads to evolution of strong and weak peaks in 850-950 cm −1 spectral range, corresponding to the formation of SrCrO 4 phase [38,39].…”

Section: Vibrational Spectroscopymentioning

confidence: 99%

Optical and magnetic properties of Gd_1−xSr_xCrO₃ (0 ⩽ x ⩽ 0.15)

Sarkar¹,

Dalal²,

De³

2019

J. Phys.: Condens. Matter

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Optical and magnetic properties of Gd1−xSrxCrO3 (0 ⩽ x ⩽ 0.15) polycrystalline samples have been investigated to identify the role of Sr2+ ion in GdCrO3 compound. Quantitative structural analysis using Rietveld refinement suggests the formation of single orthorhombic phase up to x = 0.1 composition, and in addition, a secondary monazite-type structure of SrCrO4 arises for x = 0.15 composition. Raman and Fourier transform infrared spectra also confirm the presence of SrCrO4 component for higher concentration of Sr2+ ion. Mixed valence state of Cr such as Cr3+ and Cr4+ is obtained from x-ray photoelectron spectroscopy. The presence of Cr4+ ion induces a reduction of optical band gap with increase of Sr content. The unoccupied states originate from Cr4+ modify d–d transitions. Larger cell volume and breaking of magnetic exchange pathways through nonmagnetic element (Sr) weaken the strength of interaction and consequently lower Néel and spin reorientation temperatures.

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