Structural refinement and optical band gap studies of manganese-doped modified sodium potassium lithium niobate lead — piezoelectric ceramics

Mishra, S. K.; Mishra, R. K.; Brajesh, Kumar; Ray, Rajyavardhan; Himanshu, A. K.; Pandey, H.K.; Singh, Narendra Kumar

doi:10.1142/s0217979214501100

Cited by 6 publications

(2 citation statements)

References 19 publications

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“…Band gap energy is reduced from 2.35 eV to 2.26 eV for 15 wt% Mo doping in BBFMO-0 ceramic which is the lowest for BFO to the best of our knowledge [35]. Several studies report that, distortion in FeO 6 octahedron causes different hybridization between O 2− and Fe 3+ which leads to the formation of a unique energy level in between Fe 3d and O 2p states [36]. Distortion in structure and thus a reduction in Fe-O-Fe bond angle due to lower sized Mo 6+ doping is evidenced in our structural refinement data and this probably account for the red shift in this case.…”

Section: Optical Propertymentioning

confidence: 86%

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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In this work, -Bi Ba Fe Mo O x x 0.8 0.2 13 (x = 0, 0.5, 0.10 and 0.15) ceramics were synthesized by conventional solid-state reaction to evaluate the influence of Ba 2+ and Mo 6+ co-doping on the structure, morphology, electrical, magnetic and optical properties of BiFeO 3 ceramic. Rietveld refinement of x-ray diffraction data was done to obtain the subtle structural information. A tetragonal structure of P4mm type was revealed for Bi Ba FeO 0.8 0.2 3 (x = 0) ceramic. Evolution of rhombohedral (R3c) phase was observed with Mo 6+ doping and a complete transformation to R3c phase from P4mm was found for 15 wt% Mo 6+ doping. This type of transformation causes distortion in the structure and results in changing bond angle. Magnetization was found to be improved with increasing the percentage of Mo 6+ up to 10 wt%. Canting of spin due to the change in Fe-O-Fe bond angle is believed to be the main reason behind this improvement. One secondary phase BaMoO 4 was found and becomes prominent with Mo 6+ doping. Possible formation of this impurity and its correlation with properties are explained. Microstructural analysis was done to observe the Ba 2+ and Mo 6+ co-doping effect on grain size and distribution. A correlation of grain size with electric and magnetic properties is drawn and elucidated. Dielectric constant shows an increasing trend with Mo 6+ doping. Reduction in oxygen vacancy, due to charge compensation upon high charged Mo 6+ addition, believed to be the staple reason behind the dielectric constant increment. Lastly, optical band gap energy found to be decreased with the addition of Mo 6+ and possible reasons behind this are evaluated. Overall, codoping of Ba 2+ and Mo 6+ found to have a positive influence over materials electrical, optical as well as magnetic property.

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Section: Optical Propertymentioning

confidence: 86%

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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“…The UV-Vis diffuse reflectance spectra of RENbO 4 and the bandgap values of RENbO 4 calculated by the Kubelka-Munk formulas (1) and (2) [24],…”

Section: Xps and Uv Characterizationmentioning

confidence: 99%

Ultrafast synthesis and luminescence properties of rare earth orthoniobates RENbO₄ (RE = La, Eu, Gd, Yb, Lu)

Wu,

Chen,

Xue

2024

Nanotechnology

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Rare earth orthoniobates (RENbO4) are one kind of important functional materials due to its applications in solid-state phosphors, thermal barrier coatings, and microwave dielectric ceramics. The synthesis of rare earth niobates often needs high reaction temperatures (1300 ~ 1700 C) and long processing times (from hours to tens of hours) in solid-state reactions, which can increase the study time of the relationship between structure and properties. In this work, we used ultrafast high-temperature sintering method to synthesize RENbO4 (RE = La, Eu, Gd, Yb, Lu), and found specific structure and properties in these materials obtained with specific synthetic techniques. Based on the electronegativity scale, the charge transfer energy of lanthanide ions in the YNbO4 crystal was calculated. The rapid synthesis of RENbO4 in a vacuum atmosphere generated more oxygen vacancies, and the structures of [REO8] and [NbO6] were distorted. The shortening of the fluorescence lifetime of LaNbO4 and EuNbO4 was related to the formation of self-trapped excitons (STEs) facilitated by lattice distortion. The emission peak of LuNbO4 at about 530 nm is attributed to the oxygen vacancy in the niobate group. The reported synthetic methods can provide a fast materials screening route for high melting point inorganic materials.

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Phase stability, electronic and local structures of Li-doped (K,Na)NbO3 under hydrostatic pressure from first principles calculation

et al. 2023

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Structural refinement and optical band gap studies of manganese-doped modified sodium potassium lithium niobate lead — piezoelectric ceramics

Cited by 6 publications

References 19 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Ultrafast synthesis and luminescence properties of rare earth orthoniobates RENbO₄ (RE = La, Eu, Gd, Yb, Lu)

Phase stability, electronic and local structures of Li-doped (K,Na)NbO3 under hydrostatic pressure from first principles calculation

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Structural refinement and optical band gap studies of manganese-doped modified sodium potassium lithium niobate lead — piezoelectric ceramics

Cited by 6 publications

References 19 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Ultrafast synthesis and luminescence properties of rare earth orthoniobates RENbO4 (RE = La, Eu, Gd, Yb, Lu)

Phase stability, electronic and local structures of Li-doped (K,Na)NbO3 under hydrostatic pressure from first principles calculation

Contact Info

Product

Resources

About

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Ultrafast synthesis and luminescence properties of rare earth orthoniobates RENbO₄ (RE = La, Eu, Gd, Yb, Lu)