Raman scattering, microstructural and dielectric studies on Ba1−xCaxBi4Ti4O15 ceramics

Kumar, Sunil; Kundu, Sudipta; Ochoa, Diego A.; García, José E.; Varma, K. B. R.

doi:10.1016/j.matchemphys.2012.07.042

Cited by 54 publications

(25 citation statements)

References 36 publications

(32 reference statements)

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“…are centered around the modes v 1 , v 2 , v 5 , v 8 , and v 11 . For BLSFs, the Raman bands at high‐frequency region are believed to originate from the internal vibrations of TiO 6 octahedra . The two modes v 8 and v 11 correspond to two pure bond stretching vibrations of TiO 6 octahedra and are assigned E g and A 1g character, respectively.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Jiang

Chen

et al. 2016

J. Am. Ceram. Soc.

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Structural, electrical, and up-conversion (UC) properties of Na 0.5 Bi 4.5-x Er x Ti 4 O 15 (NBT-xEr 3+ ) (0.00 < x < 0.40) ceramics have been studied. All the ceramic samples possessed a single-phase orthorhombic structure. The unit cell volume, the lattice parameters a, b, and c, and orthorhombic distortion analyzed on the basis of Rietveld refinement were observed to decrease with increasing Er 3+ contents (x). The average values of grain size were found to slightly decrease with increasing x. Raman spectroscopy revealed that (Bi 2 O 2 ) 2+ layers remained unaffected in the modified compositions, and Er 3+ substitution for Bi 3+ occurred predominantly at the A-site in the perovskite blocks causing the cationic disorder and a slight decrease in the TiO 6 octahedral distortion. NBT-xEr 3+ ceramic with x = 0.20 achieved the optimized photoluminescence. The relative intensity of green and red UC emissions could be tuned by changing Er 3+ ions concentrations. Ferroelectric measurements revealed that Er 3+ doping led to reduction in 2P r and 2E c . However, dielectric measurements showed that the incorporation of Er 3+ ions increased T c with simultaneously lowered tand at high temperature, implying that this ceramics can be suitable for high-temperature sensor applications.

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Section: Resultsmentioning

confidence: 99%

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Jiang

Chen

et al. 2016

J. Am. Ceram. Soc.

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“…Figure 7a gives the thermal annealing behavior of piezoelectric constant (d 33 ) of the C x SBN ceramic. The excellent piezoelectric constant polarized at 150°C for 20 min of all samples is founded to be 18 pC/N when x is 0.1, which is higher than the reported results in other Aurivillius material systems [17,33]. The enhanced d 33 originates from the combined effects caused by the lattice distortion and the increasing concentrations of oxygen vacancies [6,24].…”

Section: Resultsmentioning

confidence: 51%

“…is often used to dope bismuth layer piezoelectric ceramics, so that the piezoelectric properties and T c can be improved significantly. For instance, Kumar et al [17]. have investigated the properties of Ca x Ba 1-x Bi 4 Ti 4 O 15 ceramics and found that the T c (x = 0.25) was improved to 503°C with relatively large piezoelectric constant (d 33 , 15 pC/N) compared to pure BaBi 4 Ti 5 O 18 (T c = 422°C, d 33 = 11 pC/N).…”

Section: Introductionmentioning

confidence: 99%

Dielectric, ferroelectric and piezoelectric properties of Ca0.1Sr0.9Bi2Nb2O9 ceramic

Yao

Chu

et al. 2015

J Mater Sci: Mater Electron

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Ca x Sr 1-x Bi 2 Nb 2 O 9 , as one of Aurivillius ceramics, was prepared by a conventional solid-state reaction method. The X-ray diffraction study showed that the ceramic possess a pure structure and no secondary phase can be detected. The scanning electron microscopy indicates that the grains of all the samples are all welldefined, but no obvious impact on the size of the ceramics. The dielectric, ferroelectric and piezoelectric properties of the Ca 0.1 Sr 0.9 Bi 2 Nb 2 O 9 were investigated and found that the Curie temperature (T c ), piezoelectric constant (d 33 ), remnant polarization (2P r ) and coercive field (E c ) were about 552°C, 18 pC/N, 15.34 lC/cm 2 and 47.75 kV/cm, respectively. Meanwhile, the impedance and dielectric properties of this piezoceramic for practical applications have also been discussed.

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“…The Raman spectroscopy is frequently employed to probe the subtle structural distortions induced both by the tilting of octahedra and by the cationic displacements in perovskites and other related compounds. [54][55][56][57] Fig. 3(a) shows the room temperature Raman spectra of (1 À x)KNN-(x)BZT (x ¼ 0.00 to 0.10) samples in the wavenumber range of 50-1000 cm À1 .…”

Section: Structural Propertiesmentioning

confidence: 99%

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics

2018

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Raman scattering, microstructural and dielectric studies on Ba1−xCaxBi4Ti4O15 ceramics

Cited by 54 publications

References 36 publications

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Dielectric, ferroelectric and piezoelectric properties of Ca0.1Sr0.9Bi2Nb2O9 ceramic

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics

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Raman scattering, microstructural and dielectric studies on Ba1−xCaxBi4Ti4O15 ceramics

Cited by 54 publications

References 36 publications

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na0.5Bi4.5Ti4O15 Ferroelectric Ceramics

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na0.5Bi4.5Ti4O15 Ferroelectric Ceramics

Dielectric, ferroelectric and piezoelectric properties of Ca0.1Sr0.9Bi2Nb2O9 ceramic

Structure, dielectric, and piezoelectric properties of K0.5Na0.5NbO3-based lead-free ceramics

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Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Photoluminescence, Structural, and Electrical Properties of Erbium‐Doped Na_0.5Bi_4.5Ti₄O₁₅ Ferroelectric Ceramics

Structure, dielectric, and piezoelectric properties of K_0.5Na_0.5NbO₃-based lead-free ceramics