Understanding of structural evolution, dielectric performance, and photoluminescence behavior of Sm-modified Na0.5Bi0.5TiO3

Lenka, S.; Badapanda, T.; Ghosh, Sumana; Richhariya, Tripti; Sarangi, S.N.; Tripathy, Satya Narayan

doi:10.1016/j.mtcomm.2023.106738

Cited by 2 publications

(1 citation statement)

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“…The increase in grain size can be attributed to the sintering mechanism, in which the surface free energy of particles decreases due to the solid-vapour interface energy and solid-state interface energy contributions along with the diffusion of rare earth ions in the NBT host matrix and the dopant's ionic radii and atomic mass [31,32]. Among various rare earth elements, samarium is considered as one of the excellent dopants due to its optical capacity [33]. In general, there is a strong correlation between changes in the structure and morphology of the material and its optical properties [34].…”

Section: Density and Microstructural Studiesmentioning

confidence: 99%

Samarium-modified NBT ceramics: a comprehensive exploration of cumulative effects

Neeli,

Jaladi,

Sangula

et al. 2023

Phys. Scr.

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In the present report, ceramic specimens of sodium bismuth titanate [Na0.5(Bi1-xSmx)0.5TiO3] were prepared through solid-state reaction method with variations in the dopant concentrations specifically, x = 0.0, 0.1, 0.3, 0.5. The structural, optical, mechanical, and magnetic properties of lead-free NBT ceramics were investigated. The rhombohedral phase with space group R3c was confirmed in all prepared ceramic samples using X-ray diffraction patterns and Rietveld analysis. SEM micrographs and Energy Dispersive X-ray spectroscopy (EDAX) assess the morphology, grain size, overall structure, and stoichiometry of the developed compounds. FTIR spectroscopy was used for characterizing and identifying the functional groups. UV-vis spectroscopy revealed that band gap values decreased as dopant concentration increased, confirming the use of NBT-based perovskite as a photoactive material. PL spectra at room temperature exhibited reddish-orange emission. Colour coordinates and CCT values are in the range of 3483K to 5912K. At a concentration of x=0.3, the materials displayed a high Vickers hardness of 8.20 GPa and exhibited minimal wear with low frictional coefficient values. Ferromagnetic behaviour at room temperature (RTFM) was detected in Sm-modified ceramic samples, as confirmed by the VSM study. The cumulative effect impact of the rare earth dopant cation at the Bi-site of NBT was widespread and demonstrated significant potential for use in optoelectronic devices.

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