Structural, optical, and Raman studies of Gd doped sodium bismuth titanate

Behara, Santosh; Ghatti, Lalitha; Kanthamani, Sivani; Dumpala, Malathi; Thomas, Tiju

doi:10.1016/j.ceramint.2018.03.233

Cited by 40 publications

(5 citation statements)

References 28 publications

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“…Figure 4 shows the ambient temperature of Raman spectra of the composite samples CS/NBTO. Each of these spectra agrees well with those mentioned in the bibliography [41,42].…”

Section: Vibrational Investigationssupporting

confidence: 88%

Synthesis, Structural, Optical, and Electrical Characterization of Biochitosan/Na0.5Bi0.5TiO3 Composite Thin-Film Materials

Zidani,

Hassine,

Zannen

et al. 2023

Micromachines

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The purpose of this research work was to synthesis bioderived nanocomposite films by incorporating Na0.5Bi0.5TiO3 (NBTO) nanoparticles into a chitosan matrix. The NBTO nanoparticles were synthesized using a traditional solid-state technique. Then, through a solution-casting approach, flexible composite films were fabricated using chitosan polymer. The study presents a range of compelling findings. For structural and morphological insights, scanning electron microscopy (SEM) reveals a fascinating morphology where NBTO nanoparticles are uniformly dispersed and interlocked with other particles, forming interconnected grains with significant interspaces within the chitosan matrix. For the optical properties, the spectral response within the 300–800 nm range is primarily governed by light scattering attributed to NBTO particles with diameter sizes ranging from 100 to 400 nm, as well as the distinctive bandgap exhibited by the NBTO phase. The investigation of dielectric properties demonstrates that composite films exhibit markedly higher dielectric values in comparison to pure chitosan films. It is noteworthy that an increase in the NBTO content results in a corresponding increase in dielectric values, enhancing the versatility of these materials. Local piezoelectric measurements utilizing piezoresponse force microscopy confirm the expected piezoelectric and ferroelectric behavior of NBTO particles when dispersed within the chitosan matrix. This research introduces a novel class of biocompatible nanocomposite materials, combining impressive structural attributes, enhanced dielectric properties, and piezoelectric capabilities. The outcomes of this study hold substantial promise for advanced applications in opto- and piezoelectric technologies, marking a significant advancement in biologically sourced materials with multifunctional properties.

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“…Figure 4 shows the ambient temperature of Raman spectra of the composite samples CS/NBTO. Each of these spectra agrees well with those mentioned in the bibliography [41,42].…”

Section: Vibrational Investigationssupporting

confidence: 88%

Synthesis, Structural, Optical, and Electrical Characterization of Biochitosan/Na0.5Bi0.5TiO3 Composite Thin-Film Materials

Zidani,

Hassine,

Zannen

et al. 2023

Micromachines

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“…The peak centered at 118 cm –1 may represent the Bi–O bonds in the perovskite units. All the modes between 100 and 1000 cm –1 could be attributed to the presence of the Bi 4 Ti 3 O 12 matrix, while the modes between 700 and 800 cm –1 are mostly due to vibrations linked with bonds around the oxygen defects. , The maximal phonon energy 851 cm –1 facilitates the upconversion emission from Yb 3+ /Ho 3+ ions.…”

Section: Resultsmentioning

confidence: 91%

“…The Bi 4 Ti 3 O 12 host was further investigated by Raman spectroscopy under 532 nm excitation, and the results are shown in Figure b. The modes at 228, 304, 360, and 396 cm –1 can be attributed to the bending vibration of O–Ti–O bonds, while the modes at 458 and 658 cm –1 can be assigned to the symmetric stretching of Ti–O bonds. , The modes at 571 and 606 cm –1 can be ascribed to the opposing excursions of the external apical oxygen atoms of [TiO 6 ] and the O–Ti–O into (Bi 2 Ti 3 O 10 ) 2– blocks, respectively . In addition, the modes around 851 cm –1 are due to [TiO 6 ] octahedron.…”

Section: Resultsmentioning

confidence: 99%

Yb/Ho Codoped Layered Perovskite Bismuth Titanate Microcrystals with Upconversion Luminescence: Fabrication, Characterization, and Application in Optical Fiber Ratiometric Thermometry

et al. 2020

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Optical thermometry has attracted great interest owing to its noncontact and fast responsive properties in practical applications. However, some sensing errors may occur in many optical ratiometric thermometers due to the overlap of emission peaks, suggesting the necessity of developing excellent luminescent materials. Here, we report the fabrication and characterization of Bi 4 Ti 3 O 12 :Yb/Ho for ratiometric thermometry. Bismuth titanate was selected as the matrix due to its low phonon energy, high machinability, and satisfactory thermal stability. The temperature sensing was constructed on the intensity ratio of the two upconversion emission bands with wide separation in Bi 4 Ti 3 O 12 :Yb/Ho under 980 nm excitation. The wide separation endows the materials with high signal discrimination for temperature detection. The developed materials were characterized in terms of crystal structure, reflectance, and emission spectra for thermometry application. The maximum relative sensitivity was shown to be as high as 2.11% K −1 . More importantly, an optical fiber thermometry was developed based on the fabricated microcrystals, which can find its potential applications in harsh environments.

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“…Recently, Chen et al [19] reported that the amphoteric behavior of Bi ion doped BT could improve the thermal stability of ceramics. An amphoteric behavior similar to Bi ions has been reported in rare earth element doped BT and Bi 0.5 Na 0.5 TiO 3 ceramics [20][21][22][23]. Furthermore, as an effective dopant, SnO 2 could enhance the dielectric temperature stability of BT ceramics [24,25].…”

Section: Introductionmentioning

confidence: 95%

Phase evolution, microstructure, electric properties of (Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O3 ceramics

Chen

Zhou

et al. 2019

J Adv Ceram

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Ba 1-x Bi 0.67x Na 0.33x)(Ti 1-x Bi 0.33x Sn 0.67x)O 3 (abbreviated as BBNTBS, 0.02 ≤ x ≤ 0.12) ceramics were fabricated via a traditional solid state reaction method. The phase transition of BBNTBS from tetragonal to pseudo cubic is demonstrated by XRD and Raman spectra. The BBNTBS (x = 0.1) ceramics have decent properties with a high ε r (~2250), small Δε/ε 25°C values of ±15% over a wide temperature range from-58 to 171 ℃, and low tanδ ≤ 0.02 from 10 to 200 ℃. The basic mechanisms of conduction and relaxation processes in the high temperature region were thermal activation, and oxygen vacancies might be the ionic charge transport carriers. Meanwhile, BBNTBS (x = 0.1) exhibited decent energy storage density (J d = 0.58 J/cm 3) and excellent thermal stability (the variation of J d is less than 3% in the temperature range of 25-120 ℃), which could be a potential candidate for high energy density capacitors.

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Structural, optical, and Raman studies of Gd doped sodium bismuth titanate

Cited by 40 publications

References 28 publications

Synthesis, Structural, Optical, and Electrical Characterization of Biochitosan/Na0.5Bi0.5TiO3 Composite Thin-Film Materials

Synthesis, Structural, Optical, and Electrical Characterization of Biochitosan/Na0.5Bi0.5TiO3 Composite Thin-Film Materials

Yb/Ho Codoped Layered Perovskite Bismuth Titanate Microcrystals with Upconversion Luminescence: Fabrication, Characterization, and Application in Optical Fiber Ratiometric Thermometry

Phase evolution, microstructure, electric properties of (Ba1-xBi0.67xNa0.33x)(Ti1-xBi0.33xSn0.67x)O3 ceramics

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