Raman scattering study of ferroelectric Sr2Bi4Ti5O18

Wang, Jianli; Cheng, Guangxu; Zhang, S.T.; Cheng, Haiying; Chen, Y.F.

doi:10.1016/j.physb.2003.10.014

Cited by 25 publications

(7 citation statements)

References 11 publications

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“…The high frequency modes, i.e., 265 cm −1 , 565 cm −1 , and 860 cm −1 could originate from the stretching and bending of the TiO 6 octahedra, which is similar to those in layer-structured oxides. [32][33][34] The mode located at 535 cm −1 may be associated with the Fe(Ni)O 6 , which coincides with those of the BFTO (541 cm −1 ) and Bi 5 Fe 0.5 Co 0.5 O 15 (BFCT, 536 cm −1 ). [35] Compared with BFTO and BFCT, the mode at 107701-2 705 cm −1 may be related to the torsional bending and stretching of Fe(Ni)O 6 octahedra, which moves slightly to the lower frequency.…”

Section: Methodssupporting

confidence: 59%

Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Sun¹,

Niu²,

Cheng³

et al. 2021

Chinese Phys. B

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The single-phase multiferroic Bi 5 Fe 1−x Ni x Ti 3 O 15 (BFNT-x, x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) ceramics were synthesized by a sol-gel auto-combustion method, and their microstructures, ferroelectric, magnetic, and dielectric properties were investigated in detail. All samples belong to layer-perovskited Aurivillius phase containing four perovskite units sandwiched between two Bi-O layers. Ni substitution can not only improve ferroelectricity but also enhance the magnetic properties. The BFNT-0.2 sample shows the largest remnant polarization (2P r ∼ 11.6 µC/cm 2 ) and the highest remnant magnetization (2M r ∼ 0.244 emu/g). The enhancement of the magnetic properties may mainly originate from the spin canting of Fe/Ni-O octahedra via Dzyaloshinskii-Moriya (DM) interaction. In order to explore the influence of valance state of magnetic ions on the properties, the x-ray photoelectron spectroscopy was carried out. Furthermore, structural, ferroelectric, and magnetic transitions were also investigated.

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Section: Methodssupporting

confidence: 59%

Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Sun¹,

Niu²,

Cheng³

et al. 2021

Chinese Phys. B

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“…The Raman mode p8 is ascribed to the opposing excursion of the external apical oxygen atoms of the TiO 6 octahedron and the modes at p9 and p10 are associated with the symmetric Ti–O stretching. The Raman modes known to be associated with the rotation and tilting of TiO 6 octahedra are represented by p6 and p7, respectively …”

Section: Resultsmentioning

confidence: 99%

Enhanced piezoelectric properties of Sr_(1.7)(Na_0.5Bi_0.5)_0.3Bi₄Ti₅O₁₈ ceramics in the system Sr_(2−x)(Na_0.5Bi_0.5)_xBi₄Ti₅O₁₈ (where 0 ≤ x ≤ 0.5)

2019

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Fine powders synthesized via sol-gel route were employed to fabricate Sr (2−x) (Na 0.5 Bi 0.5 ) x Bi 4 Ti 5 O 18 (SNBT, where x = 0, 0.1, 0.25, 0.3, 0.4, and 0.5) ceramics. The composition (x)-dependent structural changes associated with SNBT ceramics were analyzed using X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopic techniques. Average grain size analyses carried out on the SNBT ceramics by scanning electron microscopy revealed an important role played by the dopants in inhibiting the grain growth. Dielectric constants and the Curie temperature of the ceramics were found to decrease and increase, respectively, with increase in x. The increase in Curie temperature with increase in x was attributed to the decrease in the tolerance factor. The specific composition (x = 0.3) of the SNBT ceramics exhibited improved piezo-and ferroelectric properties associated with a higher Curie temperature (569 K). The piezoelectric coefficient (d 33 ) and the planar electromechanical coupling coefficient (k p ) of SNBT(x = 0.3) were enhanced by 25% and 42%, respectively, as compared to the undoped ceramics. K E Y W O R D Scurie temperature, ferroelectrics, piezoelectric constant, tolerance factor

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“…Because of existence of SiO 2 layer, the strongest peak at 858 cm -1 becomes weaker. The symmetric stretching of VO 3.5 octahedra , which the band at 858 cm -1 represents, shows large change [12][13] . Hence, the buffer SiO 2 layer definitely influences the structure of BVO thin films.…”

Section: Methodsmentioning

confidence: 99%

The influence of using different substrates on the structural and optical characteristics of Bi₂VO_5.5thin films

Chen

Deng

Huang

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. The BVO thin films have been successfully grown on Si (100) and SiO 2 /Si (100) substrates via sol-gel technique followed by rapid thermal annealing at 650 o C. The crystalline nature of the films has been studied by X-ray diffraction and indicates all the films are wellcrystallized. Atomic force microscopy was used to study the surface morphology of the BVO thin films which shows the films are compact and homogeneous. The BVO film with SiO 2 buffer layer has a larger grain size and lower root mean square roughness than that directly grown on Si. The Raman spectra measurement in the range of 300-1500 cm -1 reveals that the buffer SiO 2 layer definitely influences the structure of BVO thin films. The optical properties of the BVO thin films are investigated using spectroscopic ellipsometric in the wavelength range of 400-900 nm. In the visible range, the refractive index of the film is about 2.42 and the extinction coefficient is 0.036.

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Raman scattering study of ferroelectric Sr2Bi4Ti5O18

Cited by 25 publications

References 11 publications

Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Enhanced piezoelectric properties of Sr_(1.7)(Na_0.5Bi_0.5)_0.3Bi₄Ti₅O₁₈ ceramics in the system Sr_(2−x)(Na_0.5Bi_0.5)_xBi₄Ti₅O₁₈ (where 0 ≤ x ≤ 0.5)

The influence of using different substrates on the structural and optical characteristics of Bi₂VO_5.5thin films

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Raman scattering study of ferroelectric Sr2Bi4Ti5O18

Cited by 25 publications

References 11 publications

Effects of Ni substitution on multiferroic properties in Bi5FeTi3O15 ceramics

Effects of Ni substitution on multiferroic properties in Bi5FeTi3O15 ceramics

Enhanced piezoelectric properties of Sr(1.7)(Na0.5Bi0.5)0.3Bi4Ti5O18 ceramics in the system Sr(2−x)(Na0.5Bi0.5)xBi4Ti5O18 (where 0 ≤ x ≤ 0.5)

The influence of using different substrates on the structural and optical characteristics of Bi2VO5.5thin films

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Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Effects of Ni substitution on multiferroic properties in Bi₅FeTi₃O₁₅ ceramics

Enhanced piezoelectric properties of Sr_(1.7)(Na_0.5Bi_0.5)_0.3Bi₄Ti₅O₁₈ ceramics in the system Sr_(2−x)(Na_0.5Bi_0.5)_xBi₄Ti₅O₁₈ (where 0 ≤ x ≤ 0.5)

The influence of using different substrates on the structural and optical characteristics of Bi₂VO_5.5thin films